Imaginate that when you release tour left mouse button the line you have just drawn is joined or grouped with the previous one. That could be an option of the drawing tools.

In fact very useful to draw in a more natural media way while using line dithering. Here are some samples of what could be automatically and instantly obtained this way :

1 2 (the dino) 3

Another IMPORTANT PROGRESS could be also the ability to vectorize the effect of featherings afterwards. That could be even more useful than contouring !!!

kindly,
ivan