Uns is just an added "word" that doesn't really need to be there and doesn't really mean anything. We are not would be a correct form for We'uns aint. It is similar to saying you all or ya'll. I imagine that much of the Eastern Kentucky dialect is influenced by by Scot/Irish since they settled in these parts and much of Appalachia, though there is some German influence as well. I guess if the game used a certain dialect in remote parts of the world or with certain social groups it might add some flavor.
