first thanks for your reply. I assumed I didn't describe my wish clearly enough so I might give it a second try. Generally in Mac OS X you can set up several desktops which you can access by swiping three fingers to the right on the trackpad (and back if you want to go back). I have a setup with my macbook internal screen plus an external screen and i would have liked to let my mouse jump to the external screen not by moving it to some pre-defined margin of my internal screen, but by using that three finger swipe to the right which would just let my mouse jump from the internal to the external screen.
Well, i hope that monster of a sentence was comprehensible, if not, just write me back. After all, it might be that what I wish doesn't work anyways. By the way, I did follow your links but couldn't find anything that would help me to adapt my mac trackpad gestures to that behavior (though i might have missed something given the drowsy state that I am in atm *chhr*)