Hi all:
It is only a suggestion, but I think that can be a good addition to implement a system of convoys between ports and islands to resupply damaged fields, it can be a fleet composed by two destroyers and four cargo ships. Sinking the cargo ships would cut supplies to islands
Another idea in the same way is to include rivers and bridges at the roadways between factorys, citys........, as in real life if you destroy an important brigde you can cut all supplies to an area.
Of course bridges will have some ack for defense, and perhaps VH near ....
Also it would add more ground targets to destroy and defend, avoiding big concentrations of people
Just some ideas
Salute, pasao