I have to say, this helps out a ton for space and the item limit. but I think this is something that could be expanded on
ores and bars could have this done ( they also look nice as decorations)
coal and ores and bars could be piled into the same stack style as wood and stone. ( and clay I assume)
pelts/furs/skins could be 1x3 and hold 6?
nearly any item can be done this way.