Manage User list:
Filter by role
Search by email
Show Full Name
Search by Full Name
Edit User page
A toggle button for disabling/enabling a user, ala the Archive/Unarchive project button. This should be coupled with a "reason" field so anyone later can see why a user was en/disabled.
Related to the above, event logging for a user's account, e.g.
"Force logout" (so an admin doesn't have to find their session in the server monitor
Email user - if an admin has to do something, it would be nice to be able to shoot them an email directly, or even automatically (e.g. Account Disabled\nDue to etc etc)