Would it be possible to make a "Hands-Free Siri" button for my car? I know I could use a standard bluetooth profile and have it powered by either a usb port of by the cigarette lighter port. It would just be a push button that would attach to the wheel or something close it by means of a clamp or otherwise. I was thinking that, if the car doesn't have bluetooth, I would connect the iPhone to the car using an auxiliary cable. If anyone has any ideas, it would be appreciated.