Shortcut to rotate your brush?

Is there any shortcut that can be used to rotate your brush on the fly instead of having to actually go into the brushes properties and change it there? I checked in the keyboard shortcuts and I didn't see an option in there. The only work around I may have come up with is to make several different brushes at different angles and then use the next/previous brush shortcut to go through those. That's not the most ideal way to go about it and if anyone has any other options could you please let me know. Thanks for any help you can give me.

Is there any shortcut that can be used to rotate your brush on the fly instead of having to actually go into the brushes properties and change it there?

Not really, but if you have specific rotations you like, you can create presets, and then while painting/cloning/whatever, you can right click and choose a brush with a preset rotation, or use the < and > keys to cycle through your presets.