I am no game designer and it is likely to be game breaking... But dual wield could be a nice addition? It's doesn't have to be anything crazy but you know just dual wielding hand guns or SMG perhaps.
I personally am not a fan of dual wielding... But just thought it adds variety to the weaponry. Would you like to see dual wielding in Destiny? Or do you absolutely hate the existence of it?
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The dual-wielding skill gets gifted to the one player with the fastest reaction time in-game