public static function get_instance_option_names() {
        $rv = array('equella_url', 'equella_select_restriction', 'equella_options',
            'equella_shareid', 'equella_sharedsecret'
        );

        foreach (self::get_all_editing_roles() as $role) {
            array_push($rv, "equella_{$role->shortname}_shareid");
            array_push($rv, "equella_{$role->shortname}_sharedsecret");
        }

        return $rv;
    }