I fully support the implementation of run and gun through rocket punch, but for all talent trees. I don't see how this is over powered at all seeing that we are a ranged class, from afar all of our abilities would need channeling still. Once the battle is up close we would finally have a tool at our disposal to give us some help. Ranged distance = nothing really changes with run and gun, melee distance means we have some tools to help us out close up.
Great Idea, sadly I doubt there will be any changes made to this class.