Add the ability to add custom speed-zone, speed-trap, drift-zone, danger-sign so you can make a custom race with custom race rules.
For example, you create a 3-lap circuit style race with a speed-trap on the back-straight with custom wining rules. Custom rules could be whoever has most points win the race. You score points for the first 5 players to cross the finish line per lap (5 for 1st, 4 for 2nd, 3 for 3rd, 2 for 4th and 1 for 5th); bonus whoever has the highest speed-trap score per lap gets an extra point.