Hello there
most servers do 2 things about shooting in the car, either they disable it entirely(which is not perfect), or allowing it (which is also not perfect).
However, I had an idea that would allow the shooting, yet make it realistic, and that is…when you try to shoot while the car is moving, you get the drunk (or tazed) effect, where the screen shakes and you cant aim probably, and the higher the speed, the larger the effect