Added a "Deadman's switch" (Not really) to the signaler, shooting while standing off makes the other guy shoot, balanced stunning, added a time limit to switching hostage modes.

Signalers: Right click verb makes you ready to signal it, being shot with it in your active hand has a 80% chance to trigger it, dropping it has a 5% chance.
Stunning always stuns you SOME, but armor can now lessen it (It used to be possible to not get stunned at all by being shot normally)
Shooting during a mexican standoff now makes the other guy shoot you too.
Added a time to how quickly you can adjust hostage things.  1.5 seconds per thing.

code/modules/mob/living/damage_procs.dm

@@ -42,9 +42,9 @@
 	if(!effect || (blocked >= 2))	return 0
 	switch(effecttype)
 		if(STUN)
-			Stun((effect - (effect*getarmor(null, "laser"))))
+			Stun((effect - (min(effect*getarmor(null, "laser"), effect*(0.75 + (blocked*0.05))))))
 		if(WEAKEN)
-			Weaken((effect - (effect*getarmor(null, "laser"))))
+			Weaken((effect - (min(effect*getarmor(null, "laser"), effect*(0.75 + (blocked*0.05))))))
 		if(PARALYZE)
 			Paralyse(effect/(blocked+1))
 		if(IRRADIATE)

code/modules/mob/living/living_defense.dm

@@ -45,6 +45,12 @@
 
 	flash_weak_pain()
 
+	if(istype(equipped(),/obj/item/device/assembly/signaler))
+		var/obj/item/device/assembly/signaler/signaler = equipped()
+		if(signaler.deadman && prob(80))
+			src.visible_message("\red [src] triggers their deadman's switch!")
+			signaler.signal()
+
 	var/absorb = run_armor_check(def_zone, P.flag)
 	if(absorb >= 2)
 		P.on_hit(src,2)

code/modules/mob/screen.dm

@@ -5,6 +5,7 @@
 	unacidable = 1
 	var/id = 0.0
 	var/obj/master
+	var/gun_click_time = -100 //I'm lazy.
 
 /obj/screen/close
 	name = "close"
@@ -589,53 +590,77 @@
 					usr:module_active = null
 
 		if("Allow Walking")
+			if(gun_click_time > world.time - 15)	//give them 1.5 seconds between mode changes.
+				usr << "You need to wait some before you can change what they can do!"
+				return
 			if(!istype(usr.equipped(),/obj/item/weapon/gun))
 				usr << "You need your gun in your active hand to do that!"
 				return
 			usr.AllowTargetMove()
 			icon_state = "walking"
 			name = "Disallow Walking"
+			gun_click_time = world.time
 
 		if("Disallow Walking")
+			if(gun_click_time > world.time - 15)	//give them 1.5 seconds between mode changes.
+				usr << "You need to wait some before you can change what they can do!"
+				return
 			if(!istype(usr.equipped(),/obj/item/weapon/gun))
 				usr << "You need your gun in your active hand to do that!"
 				return
 			usr.AllowTargetMove()
 			icon_state = "no_walk"
 			name = "Allow Walking"
+			gun_click_time = world.time
 
 		if("Allow Running")
+			if(gun_click_time > world.time - 15)	//give them 1.5 seconds between mode changes.
+				usr << "You need to wait some before you can change what they can do!"
+				return
 			if(!istype(usr.equipped(),/obj/item/weapon/gun))
 				usr << "You need your gun in your active hand to do that!"
 				return
 			usr.AllowTargetRun()
 			icon_state = "running"
 			name = "Disallow Running"
+			gun_click_time = world.time
 
 		if("Disallow Running")
+			if(gun_click_time > world.time - 15)	//give them 1.5 seconds between mode changes.
+				usr << "You need to wait some before you can change what they can do!"
+				return
 			if(!istype(usr.equipped(),/obj/item/weapon/gun))
 				usr << "You need your gun in your active hand to do that!"
 				return
 			usr.AllowTargetRun()
 			icon_state = "no_run"
 			name = "Allow Running"
+			gun_click_time = world.time
 
 		if("Allow Item Use")
+			if(gun_click_time > world.time - 15)	//give them 1.5 seconds between mode changes.
+				usr << "You need to wait some before you can change what they can do!"
+				return
 			if(!istype(usr.equipped(),/obj/item/weapon/gun))
 				usr << "You need your gun in your active hand to do that!"
 				return
 			name = "Disallow Item Use"
 			icon_state = "act_throw_off"
 			usr.AllowTargetClick()
+			gun_click_time = world.time
 
 
 		if("Disallow Item Use")
+			if(gun_click_time > world.time - 15)	//give them 1.5 seconds between mode changes.
+				usr << "You need to wait some before you can change what they can do!"
+				return
 			if(!istype(usr.equipped(),/obj/item/weapon/gun))
 				usr << "You need your gun in your active hand to do that!"
 				return
 			name = "Allow Item Use"
 			icon_state = "no_item"
 			usr.AllowTargetClick()
+			gun_click_time = world.time
 
 		else
 			DblClick()