Comment 14 for bug 857651

I've been asking around to find out why you'd not want to log into certain accounts. The cases I've head so far are:
- System users showing up (e.g. mysql. This seems like an OS bug)
- Running a server and having remote logins. There may be accounts that you want to log into to control the server (i.e. over SSH) but not graphically.

The last case makes it sound like there potentially should be a per-seat filter.