One issue you can run into when attaching a rig to a path system is that when you increase the length of that path significantly the rig will start stretching noticeably as the controllers get moved further apart along the path, this is unavoidable really as motion path nodes work in percentages of the entire path length rather than regular Maya units.
I'm working on some ideas for dealing with that with bh_pathAnim at the moment, I'm going to test this over the next few days and once I'm happy with how it's working it will be a free update for all of my customers.
bh_pathAnim can be found here - gumroad.com/l/SBUCX
Cast:Brian Horgan
Tags:maya, animation tool, script, animation, path animation, mel, bh_pathAnim, quadruped, creature, 3d, creature animation, bhPathAnimation, bhPathAnim and cg