diff --git a/code/__DEFINES/dcs/signals.dm b/code/__DEFINES/dcs/signals.dm
index b8e6acf87a3..a6378c7ea8b 100644
--- a/code/__DEFINES/dcs/signals.dm
+++ b/code/__DEFINES/dcs/signals.dm
@@ -1228,6 +1228,8 @@
 #define COMSIG_ITEM_ATTACK "item_attack"
 ///from base of obj/item/attack_self(): (/mob)
 #define COMSIG_ITEM_ATTACK_SELF "item_attack_self"
+//from base of obj/item/attack_self_secondary(): (/mob)
+#define COMSIG_ITEM_ATTACK_SELF_SECONDARY "item_attack_self_secondary"
 ///from base of obj/item/attack_obj(): (/obj, /mob)
 #define COMSIG_ITEM_ATTACK_OBJ "item_attack_obj"
 ///from base of obj/item/pre_attack(): (atom/target, mob/user, params)
diff --git a/code/_onclick/click.dm b/code/_onclick/click.dm
index 561c51dda3a..1883d13723a 100644
--- a/code/_onclick/click.dm
+++ b/code/_onclick/click.dm
@@ -127,9 +127,14 @@
 	var/obj/item/W = get_active_held_item()
 
 	if(W == A)
-		W.attack_self(src, modifiers)
-		update_inv_hands()
-		return
+		if(LAZYACCESS(modifiers, RIGHT_CLICK))
+			W.attack_self_secondary(src, modifiers)
+			update_inv_hands()
+			return
+		else
+			W.attack_self(src, modifiers)
+			update_inv_hands()
+			return
 
 	//These are always reachable.
 	//User itself, current loc, and user inventory
diff --git a/code/_onclick/item_attack.dm b/code/_onclick/item_attack.dm
index e1b7b581156..06b9ff794c5 100644
--- a/code/_onclick/item_attack.dm
+++ b/code/_onclick/item_attack.dm
@@ -68,6 +68,11 @@
 		return TRUE
 	interact(user)
 
+/// Called when the item is in the active hand, and right-clicked. Intended for alternate or opposite functions, such as lowering reagent transfer amount. At the moment, there is no verb or hotkey.
+/obj/item/proc/attack_self_secondary(mob/user, modifiers)
+	if(SEND_SIGNAL(src, COMSIG_ITEM_ATTACK_SELF_SECONDARY, user) & COMPONENT_CANCEL_ATTACK_CHAIN)
+		return TRUE
+
 /**
  * Called on the item before it hits something
  *
diff --git a/code/game/objects/items/tanks/watertank.dm b/code/game/objects/items/tanks/watertank.dm
index eb57eeb81ce..c65ecd47e16 100644
--- a/code/game/objects/items/tanks/watertank.dm
+++ b/code/game/objects/items/tanks/watertank.dm
@@ -114,7 +114,8 @@
 	righthand_file = 'icons/mob/inhands/equipment/mister_righthand.dmi'
 	w_class = WEIGHT_CLASS_BULKY
 	amount_per_transfer_from_this = 50
-	possible_transfer_amounts = list(25,50,100)
+	possible_transfer_amounts = list(50)
+	can_toggle_range = FALSE
 	volume = 500
 	item_flags = NOBLUDGEON | ABSTRACT  // don't put in storage
 	slot_flags = NONE
@@ -128,9 +129,6 @@
 		return INITIALIZE_HINT_QDEL
 	reagents = tank.reagents //This mister is really just a proxy for the tank's reagents
 
-/obj/item/reagent_containers/spray/mister/attack_self()
-	return
-
 /obj/item/reagent_containers/spray/mister/doMove(atom/destination)
 	if(destination && (destination != tank.loc || !ismob(destination)))
 		if (loc != tank)
@@ -164,15 +162,13 @@
 	lefthand_file = 'icons/mob/inhands/equipment/mister_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/equipment/mister_righthand.dmi'
 	amount_per_transfer_from_this = 5
-	possible_transfer_amounts = list()
+	possible_transfer_amounts = list(5,10)
 	current_range = 5
-	spray_range = 5
 
 /obj/item/watertank/janitor/make_noz()
 	return new /obj/item/reagent_containers/spray/mister/janitor(src)
 
-/obj/item/reagent_containers/spray/mister/janitor/attack_self(mob/user)
-	amount_per_transfer_from_this = (amount_per_transfer_from_this == 10 ? 5 : 10)
+/obj/item/reagent_containers/spray/mister/janitor/mode_change_message(mob/user)
 	to_chat(user, "<span class='notice'>You [amount_per_transfer_from_this == 10 ? "remove" : "fix"] the nozzle. You'll now use [amount_per_transfer_from_this] units per spray.</span>")
 
 //ATMOS FIRE FIGHTING BACKPACK
diff --git a/code/modules/food_and_drinks/drinks/drinks.dm b/code/modules/food_and_drinks/drinks/drinks.dm
index 273951763e5..70b93557dae 100644
--- a/code/modules/food_and_drinks/drinks/drinks.dm
+++ b/code/modules/food_and_drinks/drinks/drinks.dm
@@ -184,7 +184,7 @@
 	throwforce = 1
 	amount_per_transfer_from_this = 5
 	custom_materials = list(/datum/material/iron=100)
-	possible_transfer_amounts = list()
+	possible_transfer_amounts = list(5)
 	volume = 5
 	flags_1 = CONDUCT_1
 	spillable = TRUE
@@ -458,7 +458,7 @@
 	name = "paper cup"
 	desc = "A paper water cup."
 	icon_state = "water_cup_e"
-	possible_transfer_amounts = list()
+	possible_transfer_amounts = list(10)
 	volume = 10
 	spillable = TRUE
 	isGlass = FALSE
@@ -719,6 +719,13 @@
 /obj/item/reagent_containers/food/drinks/soda_cans/attack_self(mob/user)
 	if(!is_drainable())
 		open_soda(user)
+		return
+	return ..()
+
+/obj/item/reagent_containers/food/drinks/soda_cans/attack_self_secondary(mob/user)
+	if(!is_drainable())
+		open_soda(user)
+		return
 	return ..()
 
 /obj/item/reagent_containers/food/drinks/soda_cans/cola
diff --git a/code/modules/food_and_drinks/drinks/drinks/bottle.dm b/code/modules/food_and_drinks/drinks/drinks/bottle.dm
index cd7f93c777c..43f3a510bcc 100644
--- a/code/modules/food_and_drinks/drinks/drinks/bottle.dm
+++ b/code/modules/food_and_drinks/drinks/drinks/bottle.dm
@@ -525,7 +525,7 @@
 	list_reagents = list()
 	var/list/accelerants = list( /datum/reagent/consumable/ethanol, /datum/reagent/fuel, /datum/reagent/clf3, /datum/reagent/phlogiston,
 							/datum/reagent/napalm, /datum/reagent/hellwater, /datum/reagent/toxin/plasma, /datum/reagent/toxin/spore_burning)
-	var/active = 0
+	var/active = FALSE
 
 /obj/item/reagent_containers/food/drinks/bottle/molotov/CheckParts(list/parts_list)
 	..()
@@ -579,7 +579,9 @@
 			return
 		to_chat(user, "<span class='info'>You snuff out the flame on [src].</span>")
 		cut_overlay(custom_fire_overlay ? custom_fire_overlay : GLOB.fire_overlay)
-		active = 0
+		active = FALSE
+		return
+	return ..()
 
 /obj/item/reagent_containers/food/drinks/bottle/pruno
 	name = "pruno mix"
diff --git a/code/modules/food_and_drinks/drinks/drinks/drinkingglass.dm b/code/modules/food_and_drinks/drinks/drinks/drinkingglass.dm
index b43fec2efa3..bfa477742e3 100644
--- a/code/modules/food_and_drinks/drinks/drinks/drinkingglass.dm
+++ b/code/modules/food_and_drinks/drinks/drinks/drinkingglass.dm
@@ -67,7 +67,7 @@
 	base_icon_state = "shotglass"
 	gulp_size = 15
 	amount_per_transfer_from_this = 15
-	possible_transfer_amounts = list()
+	possible_transfer_amounts = list(15)
 	volume = 15
 	custom_materials = list(/datum/material/glass=100)
 	custom_price = PAYCHECK_ASSISTANT * 0.4
diff --git a/code/modules/food_and_drinks/food/condiment.dm b/code/modules/food_and_drinks/food/condiment.dm
index db2fb7c2d0d..31ac76a15e2 100644
--- a/code/modules/food_and_drinks/food/condiment.dm
+++ b/code/modules/food_and_drinks/food/condiment.dm
@@ -262,7 +262,7 @@
 	icon_state = "condi_empty"
 	volume = 10
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list()
+	possible_transfer_amounts = list(10)
 	/**
 	  * List of possible styles (list(<icon_state>, <name>, <desc>)) for condiment packs.
 	  * Since all of them differs only in color should probably be replaced with usual reagentfillings instead
diff --git a/code/modules/reagents/reagent_containers.dm b/code/modules/reagents/reagent_containers.dm
index d269c59b11a..3973aec29dd 100644
--- a/code/modules/reagents/reagent_containers.dm
+++ b/code/modules/reagents/reagent_containers.dm
@@ -6,6 +6,8 @@
 	w_class = WEIGHT_CLASS_TINY
 	var/amount_per_transfer_from_this = 5
 	var/list/possible_transfer_amounts = list(5,10,15,20,25,30)
+	/// Where we are in the possible transfer amount list.
+	var/amount_list_position = 1
 	var/volume = 30
 	var/reagent_flags
 	var/list/list_reagents = null
@@ -27,6 +29,13 @@
 
 	add_initial_reagents()
 
+/obj/item/reagent_containers/examine()
+	. = ..()
+	if(possible_transfer_amounts.len > 1)
+		. += "<span class='notice'>Left-click or right-click in-hand to increase or decrease its transfer amount.</span>"
+	else if(possible_transfer_amounts.len)
+		. += "<span class='notice'>Left-click or right-click in-hand to view its transfer amount.</span>"
+
 /obj/item/reagent_containers/create_reagents(max_vol, flags)
 	. = ..()
 	RegisterSignal(reagents, list(COMSIG_REAGENTS_NEW_REAGENT, COMSIG_REAGENTS_ADD_REAGENT, COMSIG_REAGENTS_DEL_REAGENT, COMSIG_REAGENTS_REM_REAGENT), .proc/on_reagent_change)
@@ -47,17 +56,28 @@
 		reagents.add_reagent_list(list_reagents)
 
 /obj/item/reagent_containers/attack_self(mob/user)
-	if(possible_transfer_amounts.len)
-		var/i=0
-		for(var/A in possible_transfer_amounts)
-			i++
-			if(A == amount_per_transfer_from_this)
-				if(i<possible_transfer_amounts.len)
-					amount_per_transfer_from_this = possible_transfer_amounts[i+1]
-				else
-					amount_per_transfer_from_this = possible_transfer_amounts[1]
-				balloon_alert(user, "Transferring [amount_per_transfer_from_this]u")
-				return
+	change_transfer_amount(user, FORWARD)
+
+/obj/item/reagent_containers/attack_self_secondary(mob/user)
+	change_transfer_amount(user, BACKWARD)
+
+/obj/item/reagent_containers/proc/mode_change_message(mob/user)
+	return
+
+/obj/item/reagent_containers/proc/change_transfer_amount(mob/user, direction = FORWARD)
+	var/list_len = length(possible_transfer_amounts)
+	if(!list_len)
+		return
+	switch(direction)
+		if(FORWARD)
+			amount_list_position = (amount_list_position % list_len) + 1
+		if(BACKWARD)
+			amount_list_position = (amount_list_position - 1) || list_len
+		else
+			CRASH("change_transfer_amount() called with invalid direction value")
+	amount_per_transfer_from_this = possible_transfer_amounts[amount_list_position]
+	balloon_alert(user, "transferring [amount_per_transfer_from_this]u")
+	mode_change_message(user)
 
 /obj/item/reagent_containers/pre_attack_secondary(atom/target, mob/living/user, params)
 	if(HAS_TRAIT(target, DO_NOT_SPLASH))
diff --git a/code/modules/reagents/reagent_containers/borghydro.dm b/code/modules/reagents/reagent_containers/borghydro.dm
index 5b0783f52f7..02e77c50b08 100644
--- a/code/modules/reagents/reagent_containers/borghydro.dm
+++ b/code/modules/reagents/reagent_containers/borghydro.dm
@@ -19,7 +19,7 @@ Borg Hypospray
 	icon_state = "borghypo"
 	amount_per_transfer_from_this = 5
 	volume = 30
-	possible_transfer_amounts = list()
+	possible_transfer_amounts = list(5)
 	var/mode = 1
 	var/charge_cost = 50
 	var/charge_timer = 0
diff --git a/code/modules/reagents/reagent_containers/chem_pack.dm b/code/modules/reagents/reagent_containers/chem_pack.dm
index 666f812e705..a6e39995eee 100644
--- a/code/modules/reagents/reagent_containers/chem_pack.dm
+++ b/code/modules/reagents/reagent_containers/chem_pack.dm
@@ -10,6 +10,7 @@
 	resistance_flags = ACID_PROOF
 	var/sealed = FALSE
 	fill_icon_thresholds = list(10, 20, 30, 40, 50, 60, 70, 80, 90, 100)
+	possible_transfer_amounts = list()
 
 /obj/item/reagent_containers/chem_pack/AltClick(mob/living/user)
 	if(user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY) && !sealed)
diff --git a/code/modules/reagents/reagent_containers/hypospray.dm b/code/modules/reagents/reagent_containers/hypospray.dm
index 103f668bf56..495d598b8b8 100644
--- a/code/modules/reagents/reagent_containers/hypospray.dm
+++ b/code/modules/reagents/reagent_containers/hypospray.dm
@@ -10,7 +10,7 @@
 	worn_icon_state = "hypo"
 	amount_per_transfer_from_this = 5
 	volume = 30
-	possible_transfer_amounts = list()
+	possible_transfer_amounts = list(5)
 	resistance_flags = ACID_PROOF
 	reagent_flags = OPENCONTAINER
 	slot_flags = ITEM_SLOT_BELT
diff --git a/code/modules/reagents/reagent_containers/maunamug.dm b/code/modules/reagents/reagent_containers/maunamug.dm
index 0ce79f72d81..b72e0a7adf2 100644
--- a/code/modules/reagents/reagent_containers/maunamug.dm
+++ b/code/modules/reagents/reagent_containers/maunamug.dm
@@ -24,6 +24,8 @@
 	. += "<span class='notice'>The status display reads: Current temperature: <b>[reagents.chem_temp]K</b> Current Charge:[cell ? "[cell.charge / cell.maxcharge * 100]%" : "No cell found"].</span>"
 	if(open)
 		. += "<span class='notice'>The battery case is open.</span>"
+	if(cell && cell.charge > 0)
+		. += "<span class='notice'><b>Ctrl+Click</b> to toggle the power.</span>"
 
 /obj/item/reagent_containers/glass/maunamug/process(delta_time)
 	..()
@@ -48,8 +50,7 @@
 	STOP_PROCESSING(SSobj, src)
 	. = ..()
 
-
-/obj/item/reagent_containers/glass/maunamug/attack_self(mob/user)
+/obj/item/reagent_containers/glass/maunamug/CtrlClick(mob/living/user)
 	if(on)
 		change_power_status(FALSE)
 	else
diff --git a/code/modules/reagents/reagent_containers/medigel.dm b/code/modules/reagents/reagent_containers/medigel.dm
index 766e2614d89..67923cce59f 100644
--- a/code/modules/reagents/reagent_containers/medigel.dm
+++ b/code/modules/reagents/reagent_containers/medigel.dm
@@ -16,13 +16,13 @@
 	throw_speed = 3
 	throw_range = 7
 	amount_per_transfer_from_this = 10
+	possible_transfer_amounts = list(5,10)
 	volume = 60
 	var/can_fill_from_container = TRUE
 	var/apply_type = PATCH
 	var/apply_method = "spray" //the thick gel is sprayed and then dries into patch like film.
 	var/self_delay = 30
 	var/squirt_mode = 0
-	var/squirt_amount = 5
 	custom_price = PAYCHECK_MEDIUM * 2
 	unique_reskin = list(
 		"Blue" = "medigel_blue",
@@ -35,10 +35,13 @@
 
 /obj/item/reagent_containers/medigel/attack_self(mob/user)
 	squirt_mode = !squirt_mode
-	if(squirt_mode)
-		amount_per_transfer_from_this = squirt_amount
-	else
-		amount_per_transfer_from_this = initial(amount_per_transfer_from_this)
+	return ..()
+
+/obj/item/reagent_containers/medigel/attack_self_secondary(mob/user)
+	squirt_mode = !squirt_mode
+	return ..()
+
+/obj/item/reagent_containers/medigel/mode_change_message(mob/user)
 	to_chat(user, "<span class='notice'>You will now apply the medigel's contents in [squirt_mode ? "short bursts":"extended sprays"]. You'll now use [amount_per_transfer_from_this] units per use.</span>")
 
 /obj/item/reagent_containers/medigel/attack(mob/M, mob/user, def_zone)
diff --git a/code/modules/reagents/reagent_containers/pill.dm b/code/modules/reagents/reagent_containers/pill.dm
index 4be8d7d1816..385d6afaf0d 100644
--- a/code/modules/reagents/reagent_containers/pill.dm
+++ b/code/modules/reagents/reagent_containers/pill.dm
@@ -23,11 +23,6 @@
 	if(reagents.total_volume && rename_with_volume)
 		name += " ([reagents.total_volume]u)"
 
-
-/obj/item/reagent_containers/pill/attack_self(mob/user)
-	return
-
-
 /obj/item/reagent_containers/pill/attack(mob/M, mob/user, def_zone)
 	if(!canconsume(M, user))
 		return FALSE
diff --git a/code/modules/reagents/reagent_containers/spray.dm b/code/modules/reagents/reagent_containers/spray.dm
index 16cc8170977..576f241d460 100644
--- a/code/modules/reagents/reagent_containers/spray.dm
+++ b/code/modules/reagents/reagent_containers/spray.dm
@@ -14,15 +14,16 @@
 	w_class = WEIGHT_CLASS_SMALL
 	throw_speed = 3
 	throw_range = 7
-	var/stream_mode = 0 //whether we use the more focused mode
+	var/stream_mode = FALSE //whether we use the more focused mode
 	var/current_range = 3 //the range of tiles the sprayer will reach.
 	var/spray_range = 3 //the range of tiles the sprayer will reach when in spray mode.
 	var/stream_range = 1 //the range of tiles the sprayer will reach when in stream mode.
-	var/stream_amount = 10 //the amount of reagents transfered when in stream mode.
 	var/can_fill_from_container = TRUE
+	/// Are we able to toggle between stream and spray modes, which change the distance and amount sprayed?
+	var/can_toggle_range = TRUE
 	amount_per_transfer_from_this = 5
 	volume = 250
-	possible_transfer_amounts = list(5,10,15,20,25,30,50,100)
+	possible_transfer_amounts = list(5,10)
 
 /obj/item/reagent_containers/spray/afterattack(atom/target, mob/user, proximity_flag, click_parameters)
 	. = ..()
@@ -132,14 +133,22 @@
 	qdel(reagent_puff)
 
 /obj/item/reagent_containers/spray/attack_self(mob/user)
+	. = ..()
+	toggle_stream_mode(user)
+
+/obj/item/reagent_containers/spray/attack_self_secondary(mob/user)
+	. = ..()
+	toggle_stream_mode(user)
+
+/obj/item/reagent_containers/spray/proc/toggle_stream_mode(mob/user)
+	if(stream_range == spray_range || !stream_range || !spray_range || possible_transfer_amounts.len > 2 || !can_toggle_range)
+		return
 	stream_mode = !stream_mode
 	if(stream_mode)
-		amount_per_transfer_from_this = stream_amount
 		current_range = stream_range
 	else
-		amount_per_transfer_from_this = initial(amount_per_transfer_from_this)
 		current_range = spray_range
-	to_chat(user, "<span class='notice'>You switch the nozzle setting to [stream_mode ? "\"stream\"":"\"spray\""]. You'll now use [amount_per_transfer_from_this] units per use.</span>")
+	to_chat(user, "<span class='notice'>You switch the nozzle setting to [stream_mode ? "\"stream\"":"\"spray\""].</span>")
 
 /obj/item/reagent_containers/spray/attackby(obj/item/I, mob/user, params)
 	var/hotness = I.get_temperature()
@@ -205,7 +214,7 @@
 	volume = 100
 	list_reagents = list(/datum/reagent/space_cleaner = 100)
 	amount_per_transfer_from_this = 2
-	stream_amount = 5
+	possible_transfer_amounts = list(2,5)
 
 /obj/item/reagent_containers/spray/cleaner/suicide_act(mob/user)
 	user.visible_message("<span class='suicide'>[user] is putting the nozzle of \the [src] in [user.p_their()] mouth. It looks like [user.p_theyre()] trying to commit suicide!</span>")
@@ -264,12 +273,12 @@
 	icon_state = "sunflower"
 	inhand_icon_state = "sunflower"
 	amount_per_transfer_from_this = 1
+	possible_transfer_amounts = list(1)
+	can_toggle_range = FALSE
+	current_range = 1
 	volume = 10
 	list_reagents = list(/datum/reagent/water = 10)
 
-/obj/item/reagent_containers/spray/waterflower/attack_self(mob/user) //Don't allow changing how much the flower sprays
-	return
-
 ///Subtype used for the lavaland clown ruin.
 /obj/item/reagent_containers/spray/waterflower/superlube
 	name = "clown flower"