jadeseven: Interesting problem. With QCAD 3 scripting it would be relatively easy to create a tool that converts all selected lines / arcs into evenly spaced 'stitch holes' with a given stitch size and spacing. If stitches have to match up at corners, it's a bit more tricky.
Alternatively, the tool that clive mentioned could be improved to offer an option for 'as many points as needed with a fixed distance between points'.
How should this be visualized in the end? Just points with a certain distance or potentially also short lines with length A and spacing B?