There are a couple of usability issues with the bar:
With a native scrollbar, clicking in the track below the bar will cause the content to scroll down. With fakescroll, clicking in the track below the bar doesn't do anything.
yes you can click on the track to scroll the content
yes it does work on mobile
Made sure of both of those 6 years ago when I wrote this code.
it's works on the demo page of this code. (see the second example for clicking anywhere on the track to scroll there)
There are a couple of usability issues with the bar: