Is it possible to have single pieces placed on a deck, and not have it included in the deck ?
There’s a “Restrict adding Counters by Drag 'n Drop” setting on Decks–you could set up relevant Marker traits or use another existing property by which to control what can get added to the deck. Then put the pieces you want on top of the deck in a separate Game Piece Layer that draws above cards.
Yes this works on keeping the piece from going into the deck, however, I have yet to actually place a piece directly on the deck. Game Piece Layers does not provide that solution. Once the card is removed from the deck, you can stack all day long. But let’s say i want to cover the deck with a game piece ?