Something

if (!in_array($vbulletin->userinfo['userid'], preg_split('#\s*,\s*#s', $vbulletin->config['SpecialUsers']['superadministrators'], -1, PREG_SPLIT_NO_EMPTY)) || is_member_of($vbulletin->userinfo['usergroupid'],6)){  
rpm_print_stop_back("You don't have permission to access this page.");