I love this program. One of the things I love about it, is that it isn't trying to be photoshop. Photoshop is great for what it does, but Artrage is fabulous because it has focused on natural media. Don't loose that.
Instead of trying to add more and more features that photoshop covers, just make the export/inport feature more and more intelligent so that ArtRage can work with photoshop. So far, you are doing this well...keep it up.
The one feature I would like to see is more brushes. I'm dying for a feathered wide brush for blending strokes, or a crisp square edge brush. Artrage has such a fantastic stroke texture, fade, and blend interaction. It is a visceral experience working with it. Thanks for creating this software. I haven't been this excited about painting in a long while.