Actually the basic campaign has a lot of added ports, they are date dependant.
The reality is that the japanese controlled everything except the bits we recaptured, there is no place for another port. I suppose as the allies get PNG, etc, ports could be added, but the bottom line is that most of the RL places they topped off are there.
No amount of added ports can help the "stranded" problems unless you did something crazy like put neutral ports in a grid such that you could "refit" all the time.
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