I use tap to click...I personally don't see a need for any "clickable" buttons at all with the multi-finger gestures and taps options. It's so much faster and easier to tap two fingers for right-click and double tap for click-drag, etc....
So a good settlement/compromise/agreement (sorry I don't know the correct word) could be a buttonless touchpad... but silent. What do you think?
PS. Why has the MBA touchpad been forgotten? With my previous MBP I used to dream about the MBA touchpad...