i dont use left foot braking because the front wheels do 90% of the stopping.. left foot braking is a style carried over from rwd, and awd cars. It works, don't get me wrong, but to use it controllably on a fwd car, will wear your brakes.. using the ebrake to control rear end slide isn't something i do either, but it was just listed as a "fun" thing to do.

As far as using left foot braking as a launch control, thats something i have never tried. i guess it lets you give more gas for rpms, while slowing the tires, but i just usually rev high, and the let the clutch out as the rpms are dropping past the appropriate rpm..

for example, rev to 2500, when the rpms drop to 2000 i let out the clutch and just feather the gas enough to pull out above idle. It sounds like it wouldn't work, but it does with practice.