I’m not a Mac developer (don’t even own a Mac yet) but I have an idea that could solve the problem:
The Mac’s Touchpad already detects a number of events like scrolling, two-finger scrolling, tap and double-tap. So theoreticaly one could hack the thouchpad’s software to detect taps on the right side of the touchpad as right-clicks… don’t you think?
Leave a comment if you know of any utilities that do this, or if Apple’s driver allows it already.
UPDATE: I went to the local Apple Store and opened the Touchpad preferences… These allow you (among other things) to tap on the touchpad to simulate a button click and also to place two fingers on the touchpad while clicking the button below the touchpad to simulate a right-click. Not quite what I asked for, but close enough.