Shift-clicking combined shields+banners moves the whole banner stack to the inventory, but only removes one banner from the crafting grid, duplicating the rest
Since the last Snapshot, with Shields, we can duplicate Banners with crafting on Benchmarking, on all gamemode.
For exemple, I've 16 banners on my benchmarking and 1 shield and when I craft the Colored Shield, it give me 16 more banners and remove 1 (so I've 31 banners).