Starting line rpm enhancer for foot brake.
This is just off the top of my head, and I'm sure someone has already done it.
I would have to sit down and think it out for a little bit, but I'm sure that you could take a choke cable and incorporate some type of "stop" on it so that when pulled it would open the throttle to the same position each time.
Pull up to the line, pre stage, pull out the choke cable while bumping in with the brake.
Would have to still go down on the gas and off the brake when the light turned green, but that method would at least let you stage at the same RPM each time without having to watch a tach.
This would pass tech in a true footbrake class with no electronics.
All good in theory, but would need mapped out and refined to work just right.
Like I said, this is just off the top off my head. Have not put any thought into the engineering of it, and will not since I can legally run a 2 step