I'd like it if it were possible to swap the position of the tool picker and colour picker, so the colours are on the left, tools on the right. The current setup seems a natural fit for right handers, but for a leftie like me it would be good if it were reversed.

(Note though that I've currently only been trialling ArtRage 2.5 for a couple of days, so it's possible that this feature is already there and I missed it. I checked the manual and the menu options and couldn't see any GUI customisation options.)