OK, I just realised today that I had forgotton to release an add-in I wrote a while back. So the Default Zoom add-in is now available from the Add-ins page.
Page rendered at Wednesday, June 19, 2013 8:53:08 AM (GMT Standard Time, UTC+00:00)
Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in anyway.