Add a seatbelt feature.When the driver or passenger clicks Q, the seatbelt button makes a clicking noise to show ur clipped in and unclipped when ur not. When ur clipped in u cannot jump out of the car until you unclip. Very easy mechanics easy to do adds a nice little detail.and if you crash you could fly out the window and take more damage if youre not wearing your seatbelt(maybe they can add a charge for not wearing a seatbelt im not sure if theres already one but ye)