Light Tree
You can let SRM control the Track Power, so it switches the power off when the race is over. SRM can also control a Light Tree, so your on-screen starting lights are better noticed.
This can be done by a simple electronical setup:
The only thing you should change about this setup is the number of LED's: SRM only uses 4 red LED's!
For the starting tree you can choose to use LED's (as in this setup) or you can also use relays (as shown above for the Track Power) to control larger lights.