Years ago - remember Gerry Beranek's throw line hand crank-o-tronik in one of his DVD's or books or something? Bow-fishing line retreiver and a plastic plumbing bend and some tape. Not midline attachable mind you, but it works. Is it faster than over the shoulder into the throw cube? Dunno. Would an electric motor improve things? Probably, esp. if it had enough umph to drag the line and throw bag out of the tree and over a lawn and was midline attachable. Still in my bag though. But most days it's just hand flaking straight into a cube.