It's a small victory: I somehow managed to add smudge brush tool in Stile. Smudge tool is quite easy to implement when you know the idea. I was surprised how nicely it works. Creating smooth edges is easier with smudge and you can do that between all colors, not just with color next to black surface (as with darkening brush). Other new features of (soon to be released) 0.82 are seam tools for scrolling the tile halfway and then working with the seam, and context sensitive F1 (currently only for icons).