It would be great to permit digitizing/tracing of point, polyline, and polygon geometries once a map is georectified, then saving them. Old maps are the best source for approximate locations of places that no longer exist or have changed names. And they are virtually the only source for approximate locations of roads, rail, former river courses. With this feature, Georeferencer could fully support "historical mapathons," which will add a great volume to the historical geodata commons. Points would be highest priority, followed by lines and polygons.