Can't send group files to/from tablet

It appears that this is an intentional restriction. What is the rationale for that?

I can see there being potential issues with multiple users sending the file to their tablets, and then having version issues when they send back annotated copies. However, that's what my group has to deal with anyway, now: we put the files on our local libraries, annotate on tablets, then have to move them back to the group library. It's rather clunky.

Is the reason not to support groups because Zotfile uses the _tablet tag (and thus different uses would all have the same "tablet" status)? If so, it seems there could be ways around this limitation.