Help stop content scrolling on touch devices

The option to stop content from scrolling isn’t doing any difference on iOS.

I’ve done some googling and come to the conclusion that a good way to achieve this would be to alter a content wrappers styles to overflow:hidden and position:fixed when the menu container is visible.

RM seems to only do overflow:hidden on the documents body.

Is there any way that I could add code so that RM also toggles the position property to ‘fixed’ of the body element, or better yet, to also specify which selector to alter (rather than body)

I don’t know JS but would be able to make changes with some guiding.