I like your "HACK" Idea, give your XP, especially caustic hack.
Imagine Caustic has put all the traps, suddenly drone hack them, and enemy team mate didn't know, they got gased, it could be suprising ambush, love it.
If the gas are close to each other, drone could hack one then move to next one, and the whole room is full of gas, gonna be hilarious !
To balance it, the caustic should say something: One of my traps has been hacked and dissapear from the map. Good team mate will pay attention to it, bad one simply got confused since they have to see the map and trap, see if this's belong to them.