Small mentioning about this sort of transparent sort of not so transparent background... if Take Underlayer's Color is active the transparent alphas will be multiplied with the background color. So even if there is no background, in theory.. in fact there is a white background that the brushes multi...

yep. a filled shape. with antialiasing. very useful tool, I use it a lot in TVP. if the line would also be stabilized, which in TVP is not unfortunately, it would be even more useful.

I think so too. also, there are 2 issues here: 1. the default canvas color is pure white, which is too bright and tires the eyes. there is no particular reason for this canvas to be white, since in fact the canvas is transparent. and I find a mid-range grey to be more useful for what I need anyway. ...