Drove some more this morning on ours (just got yesterday evening!), and it seems that relocating the pedal will help, but a more complete fix would be some sort of cam on the throttle cable that takes some sensitivity out in the initial 30% or so. Hope someone does something... it's really the only complaint we have when riding the kids slowly or something. Balls to the wall, it doesn't bother me much.

If I've got the material around here, I'm going to weld on the extention later today to try.