Just make it work like TOU:R Werewolf. Loonie made it weird and on steroids. (Also change the color to #66280D)
The Werewolf has a kill button, but they can't use it unless they are Rampaged.
The Werewolf can rampage by venting and being booted out of the vent, where the Werewolf will gain Impostor vision and the ability to kill. Their kill cooldown is really short compared to other killers, which is why their Rampage cooldown will be higher.
Note: If you vent again, you will cancel the Rampage

