Now after 1.4 I am sure many know that Slimes spawn in swamps, but cause in the main world all mobs are disabled I thought why not enable those in the Mine World, another little thing that only the Mine World can give you.
And when it comes to Villagers idk why they are disabled, villager trading were fixed according to most moderators so why are they still disabled, I want emeralds to be less rare and cost less, but without villagers that is not really possible.