Create a Network Admin UI For Editing "Signup" Multisite Users
completed by: chalet16
mentors: Austin Matzko
Currently, it's possible to register a user and have that registration disappear so that it's inaccessible to administrators. See WP Trac ticket #16001.
The fix for this task should be made against development (trunk) WordPress.
How to reproduce the problem:
A solution would be along the lines of listing signed-up users in the admin, as perhaps a pseudo user-filter, like the user role links of "Administrator" or "Subscriber" currently allow you to do. Admins should be able to delete the signup or edit the user info, such as the signup's email or user name.