I had to do a bit of research on this to find out what it was. It's a technique of shooting where you hold the string below the arrow at a given point where you can place the arrow point on target and hit that point. This obviously only works with certain ranges. It looks like it's trial and error until you get the correct holding point. I have never tried it.
When you ask if anyone has set there bow up this why, do you mean tiller the bow? If so, it would be just a matter of having the draw point be the point of a balanced tiller. A bow tillered for a normal way of shooting that was shot with a fixed crawl would draw unbalanced, not that it can't be done.
