it can be done with AutoHotKey. I have several peices of code that work perfectly: press a hotkey to rotate the brush to the right by however many degrees you choose, and another hotkey to rotate the other way. For me, I never really had a need for it so never really use it, but for other illustrators I'm sure it would be great. You'd need to become familiar with AutoHotKey before running the scripts though. Check out the forums and run a search on your topic, and you will find a little bit of info on it: