Hey Rob, Have you ever licensed (or considered licensing) your code to other software vendors? It seems to me that S+ would be a killer addition to a wide variety (or majority) of apps out there. I used to use CAD software for a living and S+ gave me a huge boost in productivity (like probably 5-10%).
I have licensed it once to a company that contacted me. However, I haven't made any effort to push it out there. In the end, the code for recognizing gestures is out there in open source form...so I'd have to imagine that if they wanted to implement it, they would :)