Yea I was thinking of using that piece since its pretty useless in the 8258 B-Model. I wish I could buy the rechargeable battery pack and the pneumatics in the LEGO store, but I think you can only get them online. The rechargable battery pack takes up SO MUCH less space than the chunky stock and my little panel covering it up makes it look like it's got bubble butt.
Also does the power functions pack at the LEGO store come with IR receiver and controller, or is that online only too?