[NuclioN]

Looks good!

In the readme:

---
ABOVE IT ADD:

$threadgroupuserid=$DB_site->query_first("SELECT usergroupid FROM user WHERE userid=$thread[postuserid] ORDER BY usergroupid DESC LIMIT 1");
if ( $bbuserinfo['usergroupid'] != 16 && $bbuserinfo['usergroupid'] != 6 && $bbuserinfo['usergroupid'] != 5 && $bbuserinfo['usergroupid'] != 7 && $threadgroupuserid['usergroupid'] == 16 )
{
$idname="thread";
eval("standarderror(\"".gettemplate("error_invalid id")."\");");
}

REPLACE THE "XX" ABOVE WITH THE ID OF YOUR STEALTH BANNED USER GROUP.
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In the readme is usergroup 16 instead of the XX, i guess this must be changed.