I have never seen this before. Forget kids, this is perfect for older hunters. My bow has had to be dropped now to 56 pounds and I can draw but can not hold so I am limited to pull and shoot. The big advantage this would allow me is to be able to hold full draw and better aim at the target. For folks like me who don't qualify for a cross bow permit but really can't do archery all that well now this could be the answer.
For those who would be critical about having this advantage I can only say that when you get over 65 your ability to do what you have always done changes. You either adapt or give up your activities.