this hack allows Admins to register new users from the control panel, even if registration is closed. when you register them, you may also select to give the new user permission to private forums, as well as having their registration information emailed to them.
file updated to version 1.1 to update from last version simply replace the big section you added in cp_users.cgi with the new big section. you can now modify user permissions when you add the user.