Black Isle? Do you mean Obsidian? Cause Black Isle had the Highwayman in Fallout 2. But like you said the game engines of the new Fallout's can't handle them.
Oh no, I fully support what Avellone and Co. did with the Highwayman. Read my first post on this. Thread to get an idea of what I'd like to see.
Also no both 3/NV's modified Gamebryo and Beth's new engine can handle it. My issue is they'll be clunky/terrible.
Fallout 1 for was capable of and had rudimentry coded companions/AI. That doesn't mean they were great. I'm looking at you Ian.
Actualy that's a terrible comparison but you get what I mean.
Edit: To clarify I support stationary cars/motorcycles/vertibirds that act as fast-travel mechanisms with resource costs in return like 2's. I don't support real time drivable cars