There use to be a modification:
https://vborg.vbsupport.ru/showthread.php?t=93543
A vb3 MOD that would work on vb4 with some care. Unfortunately, it was removed from the system earlier this year with all vb3, v3.5.0 mods.
--------------- Added [DATE]1402904281[/DATE] at [TIME]1402904281[/TIME] ---------------
Try this:
[DBTech] Threadmins and Group Moderators v2 (vB4)
https://vborg.vbsupport.ru/showthread.php?t=281850