Cycling Bar/Box !

Say you've destroyed a full chest or killed a player and only want a couple of the items dropped or more efficiently look through what has been dropped. 
The addition of a cycling bar adds a temporary and singular slot/square to your Hotbar or inventory where you can cycle/scroll/click (whatever the platform) through a large stack of things and choose what you would like to keep. In order to keep what you see from the cycling bar, you could just drag and drop and continue cycling!

It gets rid of the messiness of a large and varied stack of entities.