Concrete points for implementation:
1.) Make an option field in game settings for 'automatic heads orientation in car'.
2.) The orientation should not react smoothly but in steps. So my idea is, that the head changes between 5 "stances": full left (-60°), half left (-30°), forward (0°), half right (30°) and full right (60°). Make these "stances" adjustable in game settings with sliders.
3.) The orientation should not react on every little input but adequately to the vehicles actual turning rate. Make it adjustable with sliders in game settings. Maybe the turning rate could be extracted by the front wheels or steering wheels position. (For pilot: by the sticks position.)