Captivate 2019 (Classic) project playback speed

Looking for a quick answer here to see if there is any javascript available to enable a button in a project to play the project 1.5x, 2.0x etc. This would not be for an embedded video, but globally play the project when playing in HTML5 these faster speeds. I can find the fps script, speed script, etc - but all of these really impact the timeline resources exclusing the sound narration.

Thanks!

Dave