What about trade options? Changing the drops depending on what trades the villager offers?

The original idea (not mine, but i don't feel like finding it) was to drop villagers with specific trades available. Which would be awesome.

I feel like drops depending on the trades a villager has would be neat, but no where near worth the effort that I imagine would be required. At least while there are so many cooler features in the works. You can always name or adjust te health of your special villagers if you need them to drop something.