Well it's less about the supply chain and more about giving the bot it's resources back. Assuming it actually wants to take them.
Yeah, fair enough, that part would be nice. I don't trust the AI sometimes though, so I'm happy to manage his defenses for him - for a fee.
For what it's worth, it doesn't matter if you own it: Allied territories are counted as your own in terms of keeping the supply chains going. So if I had a bunch of territories after my ally's node, they still count as connected to my own base.
Please correct me if I'm wrong, but I really think you get the base value for connected resource nodes. The amount from structures appears to go to the actual owner. On the same note, I imagine the orbital boosts probably still stack for allies.
My AI teammates LOVE to quanta units on MY rad nodes if I don't capture immediately. And if there is only a unit or 2 left, they can beat you to it as well.
Haven't noticed that (Typically in situations where my supply chain is relying on an allied node, I'm deep in to enemy territory, and don't bother building on top of them that far up). Given that the allies territory is only a "link" to your own stuff though, I would assume anything you build on your stuff still goes back to yourself, regardless of whether or not one of your links is owned by a teammate.
Oh my gosh, yes they do, and it's annoying as hell. I've had numerous advances where I've had to halt completely, because my token "cleanup crew" behind them wouldn't have enough numbers to outrun the AI teammate trying to steal my hardwork.