1) cars should take more damage, it's ridiculous how it takes more than two m4 clips to destroy a car even without double armour. I suggest x3 damage on cars, because this is how singleplayer and other samp servers work by default – vehicles take 3x more damage than players – and no one ever complained about cars being destroyed too fast. These are cars, not military vehicle machines.
2) only light weapons allowed to shoot through window. UZI, tec9, mp5, deagle, 9mm, SDpistol. IRL it's impossible to hold an m4 in one hand and shoot it, and in the game it makes DB too much OP considering sitting in a car makes you shoot without recoil and hitbox limited to only head.