Feature Request: Tradelist =/= Inventory Filter

I mostly use Deckbox for tracking an inventory.  Often times a subset of a specific card may not be made available (for example, I have 6 copies of a card, but I've only placed 3 on my tradelist).

I'm hoping to see a filter that makes it easy to identify which cards have these discrepancies/differences, so I can update/identify more easily going forward.

Thanks!