Как задействовать кнопку "Уведомить о приходе" при выключенном контроле остатков - [VM1] Модификации и хаки

/* notify the shoppers that the product is here */
		/* see zw_waiting_list */
		if ($d["product_in_stock"] > "0" && @$d['notify_users'] == '1' && $d['product_in_stock_old'] == '0') {
			require_once( CLASSPATH . 'zw_waiting_list.php');
			$zw_waiting_list = new zw_waiting_list;
			$zw_waiting_list->notify_list($d["product_id"]);
		}

if( vmIsXHR() ) {
				$GLOBALS['vm_mainframe']->scriptRedirect( $sess->url( 'index.php?page=shop.waiting_list&product_id='.$product_id, true, false ) );
			} else {
				vmRedirect( $sess->url( 'index.php?page=shop.waiting_list&product_id='.$product_id, true, false ) );
			}