Finally, I have been waiting for this for so long I considered writing my own! I do believe scrolling tiling is a better mechanism than regular tiling, and would work really well on mobile devices.
Have you seen PaperWM [1]? It runs on top of GNOME as an extension, so you get all the benefits of a fully fledged and supported DE, and it is quite a well done implementation. I've been using it for a few months now, works very good.