I have a piano keyboard, so there are 88 individual keys. Unfortunately, I left the origins in the centers of each key. As a result, I can't rotate them properly. I could go through each one and manually correct each key, but that would be a huge pain. Is there a way to set them all at once? (I only need to move the x location on each key, in case that makes a difference).
you could use the same technique as above but instead of doing it to each key individually you could use the Multi Edit addon and shift the geometry of your keys then counter the movement in object mode.
Also back up your scene before you try the addon (still in Alpha stage) just to be safe.