I am INSANLY busy and am actually using the tone library right now because I don't have time to do this right just yet. However you really should host this on github, so I can grab it and possibly fork it. It sounds like you have a lot of functionality I don't need, but since you were smart enough to includethem, I bet you did a good jobe w/ the core functionality.
Put it up on github, and I'll test the hell out of it and probably fork it to make a minimalist version. Since I will be using a stepper driver I won't need things like the current limiting etc. I have yet to actually look at your code tho, rather than risk grabbing an old version from ur thread, I would love to see it up on github.