[Xenon]

there is a function created with this hack:

PHP Code:

function can_see_hidden($usergroupid = 0)
{
    global $bbuserinfo;

    if ($usergroupid == 0)
    {
        $usergroupid = $bbuserinfo['usergroupid'];
    }
    return in_array($usergroupid, array(5, 6, 7));  // replace the usergroupids you want
} 


the default setting as you can see takes all users which are primary users in mod/supermod/admin group

you can of course change that yourself to include/exclude whoever you want.