Well it's a bit of a conundrum I suppose. Any external device will need to connect either to the dock or headphone connector to control the iPod portion of the iPhone. There's built-in support for music/playback controls on those two ports.

Unfortunately, without either an Apple built-in Bluetooth remote control profile or the ability to run a third party background process to add control of iPod via BlueTooth signals, you're out of luck.

The only thing I know of to do right now is to forgo the TomTom holder and get something else that doesn't connect to the dock so that you can use the Parrot remote device. I actually find it pretty strange that Parrot don't provide a holder - are you supposed to just drop the iPhone on your lap or on the floor somewhere?

The other thing Parrot could have easily done was to provide music nav controls over the audio jack connector, since they already ship one to use with old iPods and analog products.

Clearly a wheel-based remote unit is ideal for interacting with a dash mounted nav/music/phone system.