If we can't even get all the repostories to use a simple repotag, we'd never get them to compile with non-standard paths!
If everyone is going to fight over the same space it again becomes a matter of authority - or a free-for-all.
So adding a tag to indicate where the claim comes from so that the end user gets to decide who gets to have their claim validated is a fight for authority as opposed to those who flatly refuse to have to claim and just want the end user to use their repo only?