OK, for first:
a sponge tool, now, with the stencils, a sponge it would be a lot funny.
Non uniform scaleable stencils.
A possibility to change the color of the ArtRage background (not the canvas color). I use a Apple 20' screen and when I use a canvas size different to the screen size the background and the canvas color are white. This (if I work for hours) tired my eyes :wink: