To me it won’t matter if US income is split or not. You will be able to do as you please anyway. It will just take more planning. In some cases it could take more time, but not necessarily. It could also work as a tactic, so the enemy isn’t sure where that stack of air units are going. In WWII the US constantly used the Panama Canal to shuttle fleet and equipment. I like that the game gives us a little logistics.
BD why is this even an issue for you. You will still be able to buy fleet on one side, and air on the other. Your ftr placed on E US should be able to land on carriers off Hawaii. Ftr placed on W US should still be in UK in 2 turns via Canada because of AB. When I play I like to keep the US in both theaters. Usually about 2/3 income goes to one side or the other for a more balanced US strat, hinging on what Jap is doing. Seeing Jap in 40P, the US will not be able to bail in the Pacific for K Euro F.
Sounds like the US income will be split as if it were playing in separate games. Everything earned on the Pacific side (including NO’s) will be spent in San Fran. Likewise for Wash w/no variances. I wonder if San Fran will continue to be considered a capital for game purposes. If Washington is taken do you have to give up you San Fran $. This could be stepping away from the capture the flag rule (I doubt it, but would be easy to implement). On a side note I wonder if something similar will be done w/India. Looks like N S Wales will keep its capital status for Anz.