Multiple Plyers Playing at once [repost, sort of]

This I have found to be EXTREMELY ENOYING, and has cause my downfall at least once. It is awful when you are attacking and you move your forces away but plan to re secure the border at the end of the turn, and when you go to do so another player has invaded!
CAN THIS PLEASE BE CHANGED so that only one person can play at a time!
CAN THIS PLEASE BE CHANGED so that only one person can play at a time!