Any many of reasons, Win7 may have a simpler apis then OSX to do more with multi-gesture that isn't the pre-canned pinch/swipe etc actions. The developers may

Any many of reasons, Win7 may have a simpler apis then OSX to do more with multi-gesture that isn't the pre-canned pinch/swipe etc actions. The developers may have received funding from Microsoft. The developers may have had more access to Win7 multi-touch tablets etc.