I must say that while it was a cool addition, because it was not working I stopped worrying about that feature and even made it so I don't see it exists in the GUI. There are other tools out there and even Windows have a decent implementation integrated in the OS. In the end the only reason I'd use it is if it allows me to simply take a screenshot of the full webpage (i.e. scrolling). I'd say either make a tool that makes a difference, either leave the burden behind. I just did a few tests right now and it seems to work properly. Without doing anything special like starting a selection from bottom.
FYKI I'm using Version :60.0.3255.70 right now.