I didn't know any accessory could cause an app to launch. I have a Logitech speaker dock that I just purchased this week and it works fine with any app I want to launch on it, including Amp. The iPod app is definitely not auto-launched. It isn't using a Bose dock at a friend's place either.

I'd love Apple to provide a way to define the "default app" or "default handler" for all the functionality it provides baked into the product. Sort of how Microsoft was forced to do in Windows. Then it'd be much easier to specify an alternate phone dialer, messenger, calendar, music player, etc.

It's about the only thing I'm quite sure of that they'll never do however.