The original post was amended after I posted my comment. It was not in the FP2 category at the time.
But it’s good news, as it’s easy to remap the camera button on the FP2. I have it set to start/stop the music player when the screen is off and to set the phone to vibrate on long press - the PBMC app takes some figuring out but you can get your hardware buttons to do almost anything you want.
Here’s a set of instructions to completely disable the camera button, for instance.