Found under the client menu, "Joystick Flycam" is a method of using the axis of your joystick (or any other game controller) to control the camera params. Up to 5 axis are supported currently, but since I'm on an old MS Sidewinder, it seems I can't use the throttle control for the zoom level 
Marv playing about with the Joystick Flycam debug option
April 27, 2007 at 4:11 pm (Second Life)
