One other thing I'd like to see, is more "friendly's" like when you were fighting with the other Native American's... I think it would add some more depth to the game, rather than just Tommy going around, which was still fun, but some more team play could be a bit fun
And as somebody else mentioned, Stealth, or turning invisible would be quite cool, the only thing that I would ask, is that you make it some what "halo-like", and not just make the person transparent... I think the glossy look of Halo's invisibility looks very good.