I think that this is one of the vqmod that every one must to have!!!
In administration backend this extension makes possible to filter products by Category.
The category <select> maintains the selection after an insert,edit or delete a product.
in version 2.0 you can:
- show/hide columns: category,manufaturer and upc.
- set to show/hide by default changing options in /System/setting - store/option
I've not tested 2.0 in other versions.
If you want to edit products inline by ajax see Ajax Quick Edit Product List (ver.3.3.2) - vqmod