There is a new and improved version available!
It mostly consists of bug fixes, some of which quite severe (including an infinite loop and, even more importantly, the pathfinding not working when entities moved across multiple regions!).

There is an (unused) new function which lets you project a position in world space onto a WED path, for example to put a camera on a path with the player's position in mind.

Download: http://superku.de/HPF_v1.26.zip