...and cannot be done by it's context menu.
One thought: links to the directories should NOT be hard-specified as dchub://some-hub/... because more then one similar directory can exist on enother clients. I think, that it can be done just as magnet links with the checksum & search: some kind of shecksum of the corresponding directory is calculated from all file's and subdirectory's checksums and their names in it. Subdirectory's chechsums are calculated as well. When user gets such a link, the client preforms the search with a special option (searching directories by the checksum) and finds a number of unique directories (more then one hardcoded and it's great!!!)
Filelists (7) may be separately shared by the user's name.