It's possible to mod in, it's just a lot of work. Add 2-3 2d labels for each important island, then have them appear at one date, then disappear at another. Then the next (in another color) comes up and replaces it. When it is liberated, it changes again.
It means 2-3 for each important spot on the map. Not hard to do, but a fair bit of work. Many of the names in game are stuck to ports, too, so you' also need to change those to no label.
It's not a problem for me since I know the dates when most fell, at least in a broad sense.
tater
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