Well for the two player one, if you have a tv similar to mine, you could change the view setting to strech it to fit, but they everything will look squished. I think it's just the aspect ratio of the game window itself that sets it up like that. I don't think you can really do a whole lot.
I have to ask though, if you have a 50" TV , what does it matter? I have a 37" and I think that's plenty big.