As an admin, I'd like to see how much space is used by libraries, all users included
Maybe in the "Library" menu, there could be a page/visualization/whatever/I don't know/ to see how much space is used by all the music uploaded by all local users.
Something that don't require to ssh|ls into the server. Just a number displayed somewhere should be enough.
Better : a chart that show who is top uploader/space eater.