as far as guns go, i think they would probably make it optional to use props to put yourself further into the game. not a controller, but even if you colud just take a water, gun, just to give you the feel, so you could pretend to shoot, and the game would respond. plus, as far as cover, you could even tape spots onto the floor, so you know where to step. it wouldn't have to be an open ended full world shooter, they could even do a game similar to time crisis, or that old game in arcaades, where you specified cover per screen. it could definitley work.
the only thing i love better than a western movie is a game...I cannot wait for this. i used to have gun for GCN....all i'm gonna say is this: I miss my dynamite bow! anyways, this looks great.