I think it'd be very useful if somewhere (perhaps in the crafting screen?) there was a toggle "Automatically disenchant patched cards before their disenchanting price goes back to normal".

Currently, because it's unknown when exactly the promotion ends, players have to disenchant cards as soon as they get them. There's also no way to disenchant multiple cards at once, so all in all it's quite time-consuming.

The toggle would solve all of these problems.