Many years ago I found a Python called "WalkThisWay" it used a different approach. It didn't use walk designer at all. The way it functioned was to load a simple walking pose and then loop it. The script actually calculated the walk travel based on the movement of the feet.

I thought this was one of Ockham's but I can't find it on his site. I doubt it would even run in a current environment but it might be a starting point if anybody remembers who created that.