auto acceleration glitch (Patreon)

There seems to be a pretty big glitch with the new tread pattern. The tyres will want to drive you forward without power. If you do add power, then it'll just add a bit more power. It seems to be related to the direction of the tread, because I reversed it, and it went backwards.

I normally wouldn't bother talking about a bug like this, and just fix it, but it seems quite problematic, so I'm letting you know that I'm aware, and am working on it.