Yeah that works, but we've found it to be more fair if people maintain until all cars are on the front straight or in the case of Monza/ Road America that the leader has to wait until past pit entry then is free to jump when they choose, if they get to the start stripe and haven't gone then its a free for all, this gives an advantage to being on the front row, and also ends the idea of people jump starting, providing they don't jump before the leader, however, the biggest benefit of this is that even though everyone is watching the lead car peoples reaction times are different some will lose, some will gain, but usually all of the position bar a few are sorted out before getting into turn 1,