I think that is too difficult, if not impossible, at any rate not easy. I exclude every day some cards, and all cards are within an old and complicated structure of categories/subcategories. I can only change by BATCH commands on a card basis, not on a category basis. The new Excluded cards category would increase the hierarchy by 1, so I would have to drop my actually lowest category - I can only see lots of problems. Maybe in 4.0 there is a simple card selection / card filter for excluded cards, who knows? And by the way I really just wanted to confirm from time to time that it was right to exclude some of my excluded cards!