This is not a jogamp problem but might be of your interest.
On our available Mac machines, Safari 6 doesn't respond to scroll events, which effectively breaks zooming in our applet. The same problem goes for embedded flash.
For applet testing, see:
http://download.java.net/media/jogl/builds/tmp2/MouseWheelApplet.htmlFor flash testing, see:
http://fcontheweb.com/articles/scrollwheel/