you may not be able to tear away this panel, but autohotkey can automate it for you. In other words, all you do is press a certain key on your keyboard once, and it will rotate your brush 'x' degrees. Press it twice, and it will duplicate that rotation amount. Press it three times, and it will triple that rotation amount, and so on, until you've come full circle with the brush angle.
www.autohotkey.com