If what I'm understanding is that you want the group to have different bonuses from the rest of the world? It's really hard to do that as @Zaarin said they are a wide group of people, in which you can't lump together certain bonuses such as horses and tipis as not every tribe practiced those things. You'd have pick a singular tribe to figure out a good design and I think the Cree are just fine in that regard.I am all for Indians to be in the game...how best to represent them and I am biased in the fact that I would want their UA UU etc to be major bonuses and strengths for that Civ in the game...perhaps can't build the U Boat or Film Studio or Electric Factory but what they can do is just as critical for a victory.
That being said if you want to play the environmentalist "noble savage" you have the Maori.
