Well the second sql statement should make the configuration menu setting visible.

Code:
SELECT (@sort_order:=MAX(sort_order)+1) FROM admin_pages WHERE menu_key='configuration';
SELECT (@configuration_group_id:=configuration_group_id) FROM configuration_group WHERE configuration_group_title= 'Cross Sell Settings' LIMIT 1;
INSERT INTO admin_pages (page_key, language_key, main_page, page_params, menu_key, display_on_menu, sort_order) VALUES ('configMultiXsell', 'BOX_CATOLOG_MULTI_XSELL_PRODUCTS', 'FILENAME_CONFIGURATION', CONCAT('gID=', @configuration_group_id), 'configuration', 'Y', @sort_order);
As has been noted if you are using a table prefix for your store then you'd have to add that to the table names. Like prefix_admin_pages and prefix_configuration group.

I think that is it.