[AreaOfEffect]

In regards to accidentally ending your turn in a single player game my solution was always to just close the program. This is made easier by keeping the game in window mode rather then full screen. The game will save all of your moves as the first part of turning and so when you return to the game you can pick up where you left off, as if you never pressed 'e' or hit the end turn button.

I have no work-a-round for being the last submitter in a multi-player game.