Add ability to swap item to the other side of a trade

Sometimes when trading I've seen users add cards to the wrong side of the trade interface. The only way to get this to the other side of the trade is to remove the item and then re-add it to the correct side.

Maybe make it a menu item when clicking on the card?

Or make it possible to long-touch the item to be able to pickup the object and physically move it to the other side?

Or (and this is the biggest stretch) add advanced functionality to the swiping option. Currently when you swipe left or right on a trade object it removes the card from the trade completely. If it's possible, you could make it so swiping towards the edge of the screen removes the item, and swiping towards the middle of the trade moves it to the opposite side.

E.g. if item on left side of trade, swiping left removes and swiping right changes side. If item on right side of trade, swiping right removes and swiping left changes side.