An item that both persanoids and residents can take. This could be in a glass case on a wall similar to that of a syringe. If a persanoid took the item they would be able to use the it to overload the circuits of all appliances (door mechanisms, lights etc.) The overloaded circuits can either be fixed or after a certain amount of time will reboot. For both residents and persanoids the defibrillator can be used to revive dead residents (this is probably too op but maybe they can only do it 15 seconds after the person has died). This would encourage persanoids to dispose of the dead bodies.
Reviving dead people will probably be too op, but it would be cool for the defibrillator to have a different use for persanoid and resident (persanoids obviously should be able to do what the residents can do too)