On iOS and Android as well JavaScript is throttled/stopped while scrolling. That's one use-case of iScroll because it doesn't use native scrolling.
Let alone the other use-cases, is it possible to prevent native scrolling (preventDefault) but then use touchmove/start/end and window.scroll to basically use the native scrollbar but no the native scrolling. In short: looks like you are scrolling (and you are), but JS still works.
Just wondering if you ever experimented with this. It's nothing I want for iScroll, just curious.