Currently my guess is one of the next items on our common wishlist will be a "super-watermill" that is 1 min production times. A few of those might be sold given water is a huge problem for mass bakeries/friaries.
How about a way to reset our tome and codex cost back down to 1? spending 8 manuscripts to make 1 codex is a pain. that is over 5 days per codex.