After some thoughts about it, I think it should be the demo man that gets an extra weapon. He's the only class in the game that doesn't have a short range shotgun-like weapon. Not sure if the new weapon would be a shotgun-like one - prolly not - but still. I find it hard to kill on short range with the demoman. Then again, giving him an extra weapon might make him uber. He will sure as hell become more deadly.