hello and thanks :)
sorry for my english...
i was organizing the management menu to be able to add in the products set the list of products that we can add, to make faster the process (not to have to click on to add product and then select the product to add).
before the change, when you go to add a product, the link that a product has in the overlay is: http://example.com/admin/commerce/products/add/name_of_product
while, if you change as i did, the menu item (i cant change the url) has http://example.com/admin/commerce/products/add/name_of_product
that it will not be a problem if the vertical tabs with additional settings (like author, collection, etc) didnt disappear and the form formating breaks a bit (things are not organized the same)...
i am creating manually a menu item for each product to resolve this.
thanks for your hard work :)