My horses don't back up if the rope accidently moves or wiggles or whatever. Why? Because my BODY LANGUAGE didn't tell them to move. It's also because I'm advanced in the program...the rope wiggling is to help get the horse tuned into what your body is saying. I have personally seen instances where the person was able to stay safe by sending a nice coil down the rope and the horse backs off because he knows what it means. Sorry, but if it's a way to keep one safe, I'm all for it. I personally have never been in danger using any of the techniques or principles outlined in the program.
We also will back our horses up by pressing on their chest and nose, and the halter knot. However, if a horse gets spooked and jumps forward toward me and I need him to GET BACK I am certainly not going to get close to the horse and press on his chest! I'll shake my rope or send a coil down, whatever is appropriate, and get that horse away from me.
Wiggling a rope, in and of itself, might not transfer to the saddle, but the concept of rhythmic motion DOES. You can't press on your horse's chest from the saddle to get him to back up, so in your mind Marecare, why do it at all, right? I'll tell you why it still works, because the concept of steady pressure translates to the saddle. If the horse knows to yield to and from steady AND rhythmic pressure that will translate to the saddle.