For example the git of extension echo (https://phabricator.wikimedia.org/diffusion/ECHO/) has no projects, but I can't add projects. I would be useful to add the project #echo here. This makes it more clear for users. The problem is, that only Diffusion-Repository-Administrators can add projects to the most repos, because you need to edit a repo to add projects. Can someone add projects at least to the extension repos?
It's going to take a lot of manual effort to associate every extension repo with the right projects, especially since projects don't exist for many of them and extension projects don't seem to follow a consistent naming convention.