I'm still working on some of this (such as borders as well as island control) but I wanted to show off a 3rd map that I'm planning on using something inspired by
@Pablostuka in his upcoming SCW scenario.
Basically, the old version of this scenario kind of devolved into "whack a mole" where the mighty naval powers basically chased around whatever the Soviets were up to. This is pretty unrealistic. Despite how many grand foreign adventures America has gone on, we aren't everywhere at once. Hence, there's now an "Interest" map that will speak to the main map (with regular geography/terrain).
From the US perspective, US forces can enter anything that is teal, dark green, or light teal. They cannot enter/attack units in other squares. Essentially, this means the US can always defend Europe, Canada (NATO), Japan, Australia, New Zealand. At the start of the scenario (1947) they can intervene in Greece or Korea, but nowhere else. Thus, if the Soviets start a rebellion in Brazil, the US can't deploy regular forces there without deciding to stop supporting either Greece or Korea (if they have a 2 maximum, in this example, though perhaps certain techs would allow for 3).
Dark Green = European Vital Interest (Europe, Canada)
Teal = USA Vital Interest (USA, Australia, Japan)
Light Teal = USA Special Interest (at start, Greece and North Korea). The US should only be able to have 2-3 regions have this status at any one time.
Other colors:
Light Green = European Special Interest
Light Red = Soviet Special Interest
Red = Soviet Vital Interest (USSR, Eastern Europe)
Light Red = Pro-East
Dark Blue = Pro-West
Yellow = China
Orange = Non-Aligned
I was thinking for Europe, what might be "fun" 'is if it costs them money to maintain tiles as "light green." Certain places (example, Hong Kong) are just one tile and the trade off is clearly worth it. Other places might be primed for decolonization as not worth it at any given moment.
Anyway, this is the solution I've come up with to keep proxy wars somewhat realistic and to prevent the US from being too strong. The US player can always fund proxies (pro-West) to fight rebellions the Soviets start, but they won't be able to just sail a carrier up and start pummeling whatever they want. You'll see the Soviets too have interests in North Korea and Greece, so they can intervene there as well.
For now, the Soviet interest is only in North Korea, Mig Alley, etc...
Honestly, it may make more sense to have a "Conflict zone" with the Non-Aligned so someone can attack them. This would be at the expense of the Pro-East/Pro-West which doesn't really need to be on the Special Interest map (which only signifies if a major can attack, anyway).