Multilogin plugin, make it just for admins?
You would need to change the line
to
Single group
Multiple groups
Enter the group ID of the group you want to be able to do it.
if($mybb->user['uid'] != "0")to
Single group
if($mybb->user['usergroup'] == "ADMIN / MOD GROUP ID")Multiple groups
if($mybb->user['usergroup'] == "Group 1" || $mybb->user['usergroup'] == "Group 2")Enter the group ID of the group you want to be able to do it.