If the idea is to control southern USSR and let northern USSR alone with a IC Romania then you should really debate about going after Persia and then decide to go east to India or west to Egypt.
Why is there the rule that industrial complexes cannot be built on islands, even if the island meets the IPC requirements? You should at least be allowed to build minor ICs on islands.
Because a minor on PI if Japan doesn’t declare war is OP for the US. Instead of 3 moves from the islands, they are now in the middle of it.
Yes, it’s correct. You can mobilize up to three units from the IC in the same turn that it’s upgraded, and up to ten units starting in the following turn.