sneak clicking the shelf will toggle items to the bottom

sneak clicking the shelf will toggle to the 25w32a version of shelves, but items should appear the same size as of current. to make it more silly, you could sneak click with a mace and the smash sound would play as you knock the items to the bottom, although this would put quite the price on this idea.

after, you would have to break the shelf, or it could be simply toggled with player fist, or perhaps you could interact with said shelf with a wind charge to revert.