disableOverscroll but keep momentum scroll on iOS


I’ve set disableOverscroll: false in app.coffee in order to have a fullscreen fixed background image and it worked great.
My question is: can we still have the momentum scroll like when we set in CSS with -webkit-overflow-scrolling: touch; or is the scroll native and there’s nothing we can do? I tried adding this property do the body tag, .padding div, with no success…
Is it like that by design?