I'm sorry, I can't make an account for Jira, the picture with the security word isn't working, so I will try to post this "bug" here:
When you play with three controllers in split screen, the screen is divided by four and there is a black space at the bottom right, many games make one player's space be wide, Minecraft should let you choose if you want to leave that black space, make one player's space vertically wide or make it horizontally wide.
This is like an idea, but I don't get it why leave one space when you can use it.
I'm sorry for my bad english, lol
or how about the empty square be a MASTER MAP that shows a collaboration of 3 players.