Hell, I beleive free aiming shouldn't be allowed for drivers, as it makes it less fun.
My idea, is to have it so that only passangers have free aiming, for drive-bys, and to have it so that passangers can select weapons 'cept melee ones) while in the car and also use the left and right buttons to poke their head out of the car, like the drive-bys in solo.