Modifies the vTec cyborg upgrade to be toggleable between off/half-boost/full-boost

Adds a set of chevron icons to icons/mob/actions.dmi to show this - provided by Toriate

code/game/objects/items/robot/robot_upgrades.dm

@@ -79,7 +79,40 @@
 			to_chat(user, "<span class='notice'>There's no room for another VTEC unit!</span>")
 			return FALSE
 
-		R.speed = -2 // Gotta go fast.
+		R.AddAbility(new/obj/effect/proc_holder/silicon/cyborg/vtecControl)
+
+
+
+/obj/effect/proc_holder/silicon/cyborg/vtecControl
+	name = "vTec Control"
+	desc = "Allows finer-grained control of the vTec speed boost."
+	action_icon = 'icons/mob/actions.dmi'
+	action_icon_state = "Chevron_State_0"
+
+	var/currentState = 0
+	var/maxReduction = 2
+
+
+/obj/effect/proc_holder/silicon/cyborg/vtecControl/Click(mob/living/silicon/robot/user)
+
+	var/mob/living/silicon/robot/self = usr
+
+	currentState = (currentState + 1) % 3
+
+	if(usr)
+		switch(currentState)
+			if (0)
+				self.speed += maxReduction
+			if (1)
+				self.speed -= maxReduction*0.5
+			if (2)
+				self.speed -= maxReduction*0.5
+
+	action.button_icon_state = "Chevron_State_[currentState]"
+	action.UpdateButtonIcon()
+
+	return
+
 
 /obj/item/borg/upgrade/vtec/deactivate(mob/living/silicon/robot/R, user = usr)
 	. = ..()