Hey Scott -
Thanks for the kind post! Interesting idea for sure. The problem with longer durations in Borderlands is that performance begins to lag very quickly with multiple simultaneous grains. That being said, I changed the max duration to 3 sec instead of 1.5 in V2, which allows for some of the longer ambient textures you mentioned. I've got a few other high priority items to work on before submitting to the app store (specifically - Audioshare, real time input recording / granulation, and various UI adjustments + bug fixes), but I like the idea of making the min / max parameter values configurable in settings. Maybe I'll put that on the list for the 2.1 release :)
Also - just to clarify my tweet from yesterday - I am still in the process of finishing a number of features for v2, so it won't be available immediately. I have not submitted anything to the app store at this point, but I am doing my best to wrap up as much as possible this month and hopefully get something in the store by the end of the first quarter. I have an very significant life event coming up in early February, so free time is somewhat unpredictable at the moment. I've been averaging something like 4 - 6 hours of development time per week, so the new features are very slowly, but surely taking shape :)
Anyway, thanks again + happy new year!
Best,
Chris