Thank you, Michael. Like Pilou I use Sketchup, too, and I was simply confused. The term "edge" is used in a different way there. A simple standalone straight line is an edge there, too.

> I still have some hope to possibly incorporate that as an option of some type in the Join command

In Sketchup everybody uses a plugin called "weld". Maybe there could simply be a "weld to join inseparable" option for the join command?