Support custom mouse tracking speeds

[devnoname120]

My tracking speed is currently set to the maximum in System Preferences → Mouse but it's still too slow. It would be great to be able to make it even faster.

Edit: uh now out of nowhere it suddenly switched to way too fast. If I change the tracking speed it reenables mouse acceleration. If I then untick and retick the Disable mouse acceleration checkbox speed goes bad to way too fast.