I'm using Artstudio Pro on a desktop Mac. When painting with a mouse, you'd assume that right-clicking would do at least something -- allow you to change the size of the brush, at the very least. But it does zilch. This seems a bit weird: to change the brush size, it would be a whole lot better to right-click than having to use the ] and [ keys. Or it would be useful to have right-click switch paint to eraser. Or, better yet, it would be great to have it programmable.