PlaidBaron wrote:Edit: Nevermind, I got it. Thanks!
Semi-joke: Screw you for not posting how you did it ._. sniff
Sorry for necropost, but just wanted to inform others like me; you can switch between players by entering Editing Mode, and selecting a nation from the drop-down list next to the Property Editor button (rightmost button in the toolbar that appears). Global Observer is on there as well.
The game still runs when you're in Editing Mode, and you can turn Editing Mode off and continue observing the nation you picked.
This is useful when you started an AI game from 'Start a Local Game, as Leave-ing will shut down the server.
You can actually access the lobby by saving the game (autosave helps at that), Leave-ing, and then loading the game. It won't start the game immediately; you can then select another nation and click the 'Observe' button. But this Editing-Mode exploit is quicker.