Get an adjustable button like the Just-n-Time Button from Biondo. That way you can really refine your lights without having to adjust rpm and what not, just adjust the button. Or get really fancy and just put a delay box in the car and wire it thru that, depending on which classes your going to run.
I am foot braking the car and delay box isn't allowed in Pro ET. Eventually I will go with a transbrake and when I do, the adjustable button from Biondo or something similar will be in the car.