Remember PB fttp where noir lime drove the jeep but you had to shoot the drones attacking it (or whatever that was). Well how about making it 2 seat for multiplayer (or even 3) 1 for driver 1 for gunner (and maybe 3rd for a passanger which can't do anything). Have a mounted gun (vehicle gun) but if gunner presses space (for example) he will lean out of the window and will be able to use his guns. And thus when you shoot a car with a gunner INSIDE (using mounted gun) only car will take damage. But with gunner leaning out of the window he might also take damage.
Please tell me what you think. Is this a good idea or nah..