Honest question: Why are so many sites overwriting the scrolling behaviour with JS, do you need that to trigger animations or is there another reason I'm not aware of yet?
That's what really annoyed me as well. It breaks the two-finger swipe back on OS X Chrome as well. Very annoying...
Sorry about that UX faux pas. I'm still learning these things. I didn't realise it was causing problems. I'll get onto it straight away. Glad you let me know. Thanks.