For the multiplayer release: New multiplayer game-> Game option: Enable monsters spawning on the farm (yes/no). I think it would be fun to work together as a community with one or two players working the farm, and one player having to guard for wandering monsters. The game mechanics to enable/disable monster spawning on the farm already exists (via the witch's hut altar) so it would be a super-easy option to add it as an option at new-game creation.