To better show off how the mod works, I've created an AAR (aka Let's Play) to show gameplay changes to Japan and China. The AAR is using an older version of the mod, but all of the basic features of the mod are in the AAR. The link to the AAR is here: Twcenter.net
The AAR will be updated roughly 2 days a week. Also, the mod's description now has a link to a Wiki page that lists every AAR that uses the HPP mod. The AAR list is for all versions of the mod, so you can find details on the HOI3 and SF versions there too.