Another idea I had is that you could press a button to highlight all items nearby. It would help a lot when you drop an item into the oil to cool it down and you forget where in the bucket the item is, or if you accidentally drop something in the water and you don't know where it is (seriously, it took me half an hour to find both of the flying machines I had made after they fell in the water), or if you accidentally grab something and the thing in front of it goes flying, and you don't know where it landed. In my eyes this would work a lot like in Minecraft, where if you hit a mob or player with a spectral arrow, then they are highlighted, and you can see them through walls and stuff.