This is obviously an idea for Grid 3, since that's meant to be much easier to write additions for. I'm thinking, what if there were a piece of cyberware that allowed a decker to "jack in" to their deck, using their CNS as additional processing power to give them a considerable advantage when decking.
Of course, this would also have several drawbacks. When jacked in, it would likely use up a large amount of brain-power, possibly knocking out senses like sight or hearing, and if an offensive hack failed, there could be a chance of brain damage, which could give the decker a temporary or permanent setback on their stats/skills, much like corpse cloning.