I', still trying to figure out WHY HDTPE is needed, since I didn't do this intentionally. I figured if by next release I had yet to figure out what was going on I would list it as a requirement. Not everyone seems to need it, the issue has only been brought up a two times, and I know that I myself can deactivate HDTPE and load the game just fine.
The idle is downloadable someplace here on LL. I know I HAVE it someplace, but I don't use it personally, I just used in that video as a collision demonstration. As tor the " bounce " physics themselves, my personal HDTPE settings are here on LL under the HDT download section.