Can the macbook air trackpad play nice with the iOS simulator? Does anyone knows if (and how) I can get my MacBook Air trackpad to feel more natural when used with the iOS simulator ?

It should be easier to use the iOS simulator with the trackpad - but it's not, it's way more difficult to scroll :-( It feels weird but it's the only time I wish I had a mouse on my mac book air - to emulate a touch screen :-|
Unfortunatly the simulator was not built to understand multi-touch gestures which is strange considering the rest of the OS has. I think you will just need to wait until Apple updates the simulator.