In the Admin Account you can access and edit the Tree View of all of your source files, edit All Tags, Album Art, disable Start Screen and every other function currently available and also remove the Tidal Tab for those of who do not use Tidal.
The Admin would have the ability to setup a User with Tick Boxes giving the user access to the above mentioned.
This way a User on my network cannot alter my library and just use Roon strictly as a Music Service on our network without screwing with any of the fine tuning that I have set up.
Multiple Users would not be necessary if more than one device at a time could be used on the network.