Adding a new nation and adjusting the start date for a save. The latter could be tricky if the start date is allowed to be changed by not just months but years, because you'd need to either progress the careers of all existing real people in the game before the save can actually start, or have a completely newgen database of players and staff (which would be faster to set up but would have no trace of real people). Creating a new country should be less of a problem, I think.
*Official* Editor Feature Requests
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Adding a new nation and adjusting the start date for a save. The latter could be tricky if the start date is allowed to be changed by not just months but years, because you'd need to either progress the careers of all existing real people in the game before the save can actually start, or have a completely newgen database of players and staff (which would be faster to set up but would have no trace of real people). Creating a new country should be less of a problem, I think.