We can absolutely optimize the standard functions of trackpad as mouse replacement. Trackpad can be used for scrolling and click just like in Windows Based Laptop.
Zoom can also be done from trackpad easily by only pressing it like usual with two fingers and then move one of the fingers up or down to do the zoom. Do not forget to press the Ctrl key otherwise you will do usual scrolling.
It is easy. Isn’t it? You need Mac OS X Leopard on your MacBook or MacBook Pro.