Just like in real life, inside all vehicles, the player should be-able to turn on/off lights INSIDE it. It would be just like a menu for current lights on/off, but would say "inside lights on/off" So when its a night mission and you're transporting a team in an APC, Helicopters, or any transport vehicle, the lights that are ALREADY inside the vehicles can be turned on/off.
This would be a highly realistic and offer help to those who do not have night vision because you simple can not throw a chem-light inside a car and drive.