I've just been hand tracing a jpg image someone asked me to turn into a drawing.
Here are my notes on the process:
When moving points they need to be able to snap to points on the curve of lines of other shapes, maybe controlled by being in the same group.
Smoothing worked quite well, it would be nice if there were some option to do it to the contours of an image either, Fitting when smoothing, Snapping curves to to an underlying image when editing a curve over an image, could be controlled by layers and opacity etc..
Another feature that would be nice is to snap one part of a path to another part of a path, breaking segments where necessasasary.
So say you have two hand drawn paths, where some segments of one are close to or partly overlap the some of the segments of the other path.
An option to fit the two segment sets of the path that are close to each other would be nice.
I expect I can prototype some of this.