When playing on single player, go into the Options screen and set your difficulty to "Peaceful". Next, change difficulty via game commands to "hard" (type /difficulty h or command block). Game will be set to hard and spawn a hostile mob for example. However, if you simply view the Options screen again, the game will auto update difficulty. Hostile mobs disappear.

This is a huge issue with Custom Maps for 2 reasons. If the player simply views the Options screen to go into video settings or something, their difficulty gets updated and can either remove all hostile mobs, or if the command difficulty is has been to peaceful, and the player has difficulty preset to Easy/Normal/Hard, hunger is now an issue.

I'm not asking to update the menu with commands, I'm asking to only change difficulty if the player actually physically presses the Difficulty button.