Suggestion: Slowing down the top speed of vehicles. Its fairly unrealistic to be going 200-300 in most of these cars. Also the possibility of a racing app rework, the large glowing markers in front of your eyes are unrealistic and it instead show the course on the GPS.
How it will expand RP: A more realistic and fun way of driving will hopefully help to kickstart the racing scene which many people are working on creating. Also the slower vehicles should create escapes with PD to be more fun. With the slow down of all civ vehicles cops can hopefully too get out of corvettes which just seems silly.