You can see it all over this forum, allow output via the dock connector (and yes, I have read that you can jailbreak it). Paying an extra $30 for this app, in addition to the one I already have for my iPhone, makes this a reasonable request.
If you need the code to do this, here it is.
Are you guys getting feedback from your twitter account (MisterSling)? I've posted a couple of ideas there, absolutely no response.
Keep up the great work!