How can i get manual control of my iPod while it's connected to an in-car accessory?

Hey Guys,

I'm hoping you'll be able to help me!

I have a Pioneer stereo system in my car which has an iPod adapter to which I connect my iPod and thus am able to play my iPod tunes through my car stereo.

Now, while to iPod is plugged into the accessory the iPod's manual function (I.e. I am not able to physically press the buttons on the iPod to change tracks) and the iPod can only be accessed through the cars stereo system.

So, my question to you is this;

Is there any way, any jailbreak, any tweak I can do to the iPod or the car stereo that will allow me to gain manual access over the iPod while plugged into the cars accessory?

Many thanks in advance