Is it possible to get access to any of the events raised by the phone\'s physical buttons? Specifically the volume buttons. A push in any direction would be great with this.
Only the Back button, and even then your ability to do things is severely limited. Modifying the behavior of any of these buttons (outside of the allowed modifications to the Back button) will cause your app to be rejected from certification.
Here is what the WP7 UI Design and Interaction Guidelines say: