Select users watching...

Allow for several user acounts.
Main reason would be to scrobble stats to the correct user.
If we are several family members all watching the same tv show, but separately. Each family member wish their own watch-stats.
Compare to Netflix…

You could expand this concept to limit a user to some content, like Kids acount and password protected adult acounts, that is not my main concern though.

It seems something like this may be coming in tvOS 11…

This seem to be for the complete apple TV. That might be a solution.

I would like to have a common setup for my library and those settings. But separate the scrobbling per user, also allow for separate Trakt accounts.
I think this must be a function in the app, or at least the app need to support a muti-user environment.