This may be a possibility, I did not know that van buren ever finished/released. I haven't played new vegas.
At the moment everything is still quite early in terms of development, and I have to go back and redo some coding issues, which is annoying and means jumping back quite a few steps, so i am working up the motivation to do it.
I am certainly not against using more content, from the other sources, essentially my vision for the mod is one that 'sort of' begins after F1 and before F2 so the latter stages of game play would benefit from the elements you mentioned.
Like I said though i haven't played either so haven't added them to my plans.
That imperialism/bureaucratic/ central government issues sounds like a good weakness for NCR though, perhaps adding to number of city costs...although that weakness would probably also apply to BoS and Enclave...well lets face it everyone would probably suffer from that issue....hmmm dunno. Certainly feel free to offer suggestions from those sources. I certainly won't shut an idea down just because it is from X version of the game.
It is just that the stuff I happen to like the most comes from F1, 2 and tactics is all.