Forcing bluetooth for iPhone incoming calls Is there anyway to force the iPhone to always use Bluetooth for incoming calls? - I'm on a motorcycle and have my iPhone set to auto answer calls, problem is it answers with the built in iPhone headphone/microphone instead of the paired and connected bluetooth headset.

I also cannot answer with the button on the bluetooth headset as it is inside my helmet.

Any ideas? - My iPhone is jailbroken if that helps.
There's no way to do this via the iPhone itself, but there are voice-controlled Bluetooth headsets (such as the BlueAnt Q2) that would allow you to take the call on the headset without pushing a button.