Seems simple enough, I actually thought this was possible, tried it, then looked at the wiki to make sure. Searched here and on the reddit and don't see anything about it.
Using sneak (shift) and right clicking a hopper would change it's output direction. It would cycle through the 5 possibilities of down, north, south, east, west. I know, you might say just place the hopper by pointing at the block you want it to output to. Sure, but if you miss-click and it points in the wrong direction? Or it's not in a convenient spot to do so? Break the hopper, try again, etc. Seems a fairly simple addition that shouldn't be too hard to implement, and actually brings more functionality to a hopper. Say you have one feeding into a chest, and the chest gets full, just change it's direction easily so it points to a new chest that's empty. It would also make setting up & modifying large chains/groups of hoppers much easier.
This idea brought to mind the possibility to have it controlled by redstone somehow to automatically switch when it detects that the container it's currently outputting to is full, but that would just be gravy.
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