Why does alpha seem to be such a problem for paint packages? Really hacks me off. GIMP's Color to Alpha filter is very handly, but like Smurftra I'd just like to be able to edit the alpha channel directly (in a simpler way than GIMP - as far as I can tell you can only reduce alpha with the eraser - why can't I just draw a lower alpha on top?) - surely that's not too much to ask?