Noticing just now that you point to my solution and ask if and how to fix it in Articulate's JS files.
Well you can change the frame JS-files in your Articulate folder at will and then it behaves exactly as you want. Problem however is that on every update the files will be erased and you have to redo it. You could try and override the generated frame.desktop.min.js from within Storyline, but as all code in Articulate is minified and heavily obsfuscated...well it is a real puzzle to get it working..and as said before...every update will change things...
