NST is, at least to me, is about the best mobile app I have used. I can not even consider getting a handset where I cannot run it.
Besides, even as there are lots of suggestions and possible ways to improve it, it is already a very mature and reliable product. And there are TONS of people who would want it if they knew it existed.
Most sports freaks do not spend that much time on the internet looking for ways to play with their phones ;)
Nearly everyone I have talked to and recommended NST has commented on how come they didn't know that they wanted it because they didn't know it exists. Maybe you should graduate a version even as you already are working on with whatever your plans are, to get it out there.