Hi TIG,
I don't know if you are still doing a revamp of this very useful plug-in. If you are, can you make the path of the xref'd files relative to the master file?
We are using it to edit files from a Google Drive, so whenever one of us updates the master file, the others would need to re-path the xref'd files.
I know group editing is not what's the plug-in was designed for but I think it could work.