Trackpad-Zoom-Trick für Besitzer einer kabellosen Mighty Mouse

«If you have a (new) Mighty Mouse, and have enabled the function for "zoom using scroll ball while holding..." (in System preferences -> Keyboard and Mouse -> Mouse), then when you use the laptop without the mouse, and hold down the key that you have selected in the above option and do a two finger scroll, it zooms with the scroll, as if you were using the scroll ball of your Mighty Mouse.» macosxhints.com.