[LAP1DOUG]

In my experience, one of the keys to left foot braking is to have your seat belts or preferably a harness locked into position. Otherwise when you left foot brake, it will throw your body weight onto the brake pedal, and it will be very difficult to modulate.

I have used this technique to good effect in autocross, and in a rolling start in road racing. At the start in a road race, if you get on the gas and hold the car back with the brake, it can give an advantage when the green flag flies. Otherwise, I have never used it on a road race course.

Good luck...