Right now, the Left and Right triggers (Xbox One) have no use for passengers in vehicles. This would offer options for passengers to aim out vehicle windows (LT) and shoot (RT) breaking the window if not already broken. Player will NOT be allowed to throw consumables as consumables can damage vehicles and all it takes is 1 "not my best throw" or deliberate vehicle sabotage to stir player drama.
There is a catch: *Must be within Light Carrying capacity; weapon cannot weight more than 12lbs.
Something just doesn't seem reasonable about sticking a 4-foot long, 25-pound cannon out the window, or any weapon that would be difficult to operate with such a limited space.