Changing gamma with isboxer

I used to have a macro in WoW that I used to change my gamma, it would turn the gamma value up when left clicked, and down when right clicked. This was a really great way to quickly change the gamma in those particularly dark spots. But in windowed mode the gamma slider doesn't work. So I was wondering if it is possible to have ISBoxer change the gamme with some key-combination, if not, I'd like to suggest the functionality as a feature .