Gerome:
If you think of any other tools that would help for the use of this module, let me know and I will try to add them to the "Multisite Tools" in the admin section.
No that was just a work around for the post from streetglow , because in the extension that hi posted is not an imput field tor the products filtering in admin to be insered in the ptoducts_site database table.
The category filtering is better when you want different categories on different sites,(the usualy this is needed), but if you want the same categories but with different products the product filtering is faster sollution.
BTW. Dou you solved the filtering on (products all, products new , products special, duplicated listing and advanced search pages)?.
If yes can you send me that files please, until you release new version.