For safety, I tuned out reverse.
And so, my three wires were detaching some, and leading to glitchy throttle and brakes. After cleaning it all up, and retaping etc, I flipped it over, and tested. So far so good. And so, I tested the brakes, applying them fully. Lo and behold, it creeps in reverse.
This is fantastic. When I dont cut a turn tight enough, I get off, and kick board around, and start again. Now, I can just hold brake full, and back up a bit, and hit throttle and go. No switching, no mistakes. Easy peasy.