[kh99]

Try this: create a plugin using hook location global_bootstrap_complete and this code:

global $vbulletin;
if (is_member_of($vbulletin->userinfo, 2, 3, 4))
{
    $vbulletin->options['searchfloodtime'] = 0;
}

Change "2, 3, 4" to the list of groups you want to change.