I would like to see a change to the brushes pop-up in ASP. What I find a bit frustrating is that the brush editor and the brushes list is in the same window. When I have the brush editor opened the brushes are still sort of visible at the bottom, but not really useable. When I want to select a brush I have to click out of the editor, which sometimes takes two clicks.
I think it would be easier if I had two buttons: one for brush selection only, and one for brush editing. If you don't want to add a button, perhaps the "more..." menu could also be used to access the brush settings. It seems more logical this way for me, as these already carry some of the brush specific options.