DB-configuration

setting for enabling/disabling the feature:

 INSERT INTO `configuration` (`configuration_id`, `configuration_key`, `configuration_value`, `configuration_group_id`, `sort_order`, `last_modified`, `date_added`, `use_function`, `set_function`) VALUES (NULL, 'WOMD_CUSTOMSEARCH_FALLBACK_ENABLED', '0', '1419', NULL, NULL, '', NULL, NULL);

setting for your CustomSearchEngineId:

  INSERT INTO `configuration` (`configuration_id`, `configuration_key`, `configuration_value`, `configuration_group_id`, `sort_order`, `last_modified`, `date_added`, `use_function`, `set_function`) VALUES (NULL, 'WOMD_CUSTOMSEARCH_ENGINEID', 'INSERT_YOURS:HERE', '1419', NULL, NULL, '', NULL, NULL);

setting for your API-Key:

  INSERT INTO `configuration` (`configuration_id`, `configuration_key`, `configuration_value`, `configuration_group_id`, `sort_order`, `last_modified`, `date_added`, `use_function`, `set_function`) VALUES (NULL, 'WOMD_GOOLE_API_KEY', 'INSERT_YOURS_HERE', '1419', NULL, NULL, '', NULL, NULL);