not much of a Tweeterer, but lookin at the screens I'll say that you've probably hit on something. Gtalk is designed that way because it works.

VolScroll, tho . . . not sure about it. on my Gal S2, the vol buttons are really out of the way. I'll bet that the only time i'd use them with this app would be when i only could use one hand. even then, it's just as easy to hold with hand and thumb scroll...

And when's the only time you'd need 1-handed scrolling? Behind the wheel of the car. Neat idea, to be sure... just not sure if it's practical.