I use Memento as a database for some stock-register (ie Wine) with items with a barcode and I have a field as well which indicates how many of these I have in stock (How many bottles of Wine X). When I scan an item, it searches the item in the db, but it would be nice that it has a button that can be linked to this "stock field" so I can add or remove 1 single item in this stock (ie: add 1 bottle).
(Now I do it via "Change Item" and then manually add/remove this item)