This is called Spin-A-Split, which is a great idea and I think it was Duncan that came up with it. Or at least at his site wiring diagrams is the first place I ever heard of it. The only down side is you have to give up one pot for it, which I think is the reason the idea isn't a lot more popular than it is. I like to think I came up with the "splat" (part split, part tap) idea on my own, and technically I sort of did because I didn't get it from anyone else. But that's not the same as saying no-one else thought of it before me, and I think somebody did, probably more than one but I didn't find that out til later. It's really not such an out-there idea that a bunch of people haven't considered it over the years -- I'm not that smart.