Multi-User settings

Now that we have something that runs "behind" xochtil, one could have multiple users environment. Basically a small program, which bindmounts USER_A to /root or USER_B to /root and make the user selectable during a login screen of oxide together with #15, multiple people could share a rM, keeping their own data. Not sure if this works for the sync with the rM server (e.g. can you create more than one account for a single rM unit).
Anti-thesis to this would be given by Gollum "My PRECIOUS!!!!"