The problem is that hardly any apps take advantage of two mouse buttons, as Apple don't provide them as standard.
The Mac usually uses a key combination instead of the right button mouse, almost all apps support this. The right button is used for this function so you'll find almost all apps will automatically use it.
Gah.. OSX is a PITA...
It take some getting used to yes, but once you've used it for a while you'll not want to go back.
BTW the 12" PowerBooks can put out quite a bit of heat when you push them.
There's plenty of audio apps for them though.