Having recently learned more about unwrapping, I realized how powerful the unwrap algorythm within RC is. https://support.capturingreality.com/hc/en-us/community/posts/360019538991-UV-Map-Gutter-Problem
Maybe in the course of tackling th Bug in the link, it would also be possible to implement a few more options by which the user can influence the outcome. Most obvious in my view would be to be able to influence the size of the texture islands, for example by limiting either the absolute size or number of triangles. But also the angle between triangles could be an option for user intervention.
Maybe this is completely unrealistic, but if it were possible to isolate texture islands by color (at least to a certain degree), that might also help to further enhance the quality of the unwrap.