I guess it's theoretically possible to include Cold War stuff, but you would need to:
1. Completely rework the economy to include things like money, monetary policy, trade imbalance, etc.
2. Completely rework resources to include more complex ways to obtain them, plus lots more resources
3. Completely rework research to include some investment and return, to make things like the Space Race and arms race possible instead of each country just researching at the same pace
4. Completely rework the way divisions work to not only make small formations and asymmetric warfare possible and ideal in the Cold War stages, but also make the mechanics change somehow so that doesn't make small formations the most effective for the WWII era
5. Completely rework naval gameplay (again) to make it able to represent the transformation of submarine warfare
6. Completely rework diplomacy to make it resemble...diplomacy
7. Develop a UN mechanic
8. Develop functional focus trees that are able to interact despite going off the rails in 1936 and it's now the 1960s
9. Completely rework air warfare to get a realistic number of planes rather than blotting out the sun with fighters to get air superiority
And that's just off the top of my head. Now I for one would like every single one of these things in the base game as of this very moment, but lots of people wouldn't. I think they're wrong, but that doesn't mean too much.