I would like to suggest a few things regarding dungeons. If we have already completed the dungeon…IE the Witch Queen etc. Then why not have them drop at least Skeliton Keys. Some of the dungeon runs are really fun. But not much reason to go back to some of them.
Now if they offer a type of loot already then fine. Dregs is fine as you get the meat. Jhebal is fine because he offers Shade Bloom.
For Dungeon bosses who guard recipes which most already have, Skeli keys could be a fun thing. It would give a lot of us a reason to go back to the dungeons and go through the content again and travel to those places.
Maybe make it a % chance to drop as to avoid farming.