I do exactly what Richard230 does except I also have a lever on a momentary switch on my left handlebar that activates the brake light to give me 100% regen in ECO mode. In off-road riding I am frequently tapping regen to hold a certain speed on steep downhills. This is more convenient than frequently pulling partial brake lever to light the stop light and trigger regen. However, on city streets I do use the brake lever so that I am ready to brake hard if I need to.
100% regen in ECO mode is actually 25% of controller rating (400A) so it would be clearer if Zero had stuck with their original definitions of % regen. The stock setting for SPORT is 15% which in the new terminology (25% relating to 100%), that would be 60% regen.
I have both SPORT and ECO set at 0% regen with no brake light, for easy coasting, then SPORT is 60% with brake light and ECO is 100% with brake light. The reason for the lighter regen, with brake light, in SPORT is because sometimes the 25% ECO regen can break the rear wheel loose on soft terrain (not good).
Harlan did the SPORT programming for me since it can't be done with my iPod.
Another thing I had Harlan do is lower the speed at which regen quits. The factory has that speed at 15mph (on the FX). This is way too high in dirt riding. The way it works from the factory is; the regen starts tapering off at a set speed and then quits completely at a lower speed. It's all based on motor rpm. Harlan lowered both points for me and now regen starts the taper off at a lower speed and doesn't quit completely until I'm down to about 1 1/2 mph. I can actually stop at stop signs and lights using only regen now. I actually would like to also get rid of the tapering off but I don't know if that is possible.
Trikester