Medieval Minecraft has left out some amazing mods that would greatly enhance gameplay. I would like to suggest a few to be added both server and client side. something everyone can vote on.
the first one is Origins Classes.
After picking your origin you then pick a class your origin can play. which can also be utilized for a player driven economy in some way.
The second one is of course Bewitchment somehow it was left out of the latest release. probably due to late updating or something.