@janole has released a new beta update for Gravity which fixes the audioboo not playing issue on the Nokia N8, but much more impressively brings a brand new keyboard to the application and brings a full qwerty keyboard to portrait mode.

I think what I test typed says it all

DOWNLOAD BETA Gravity for S^3 (4140)

UPDATE: Oh just found the additional gravity symbols by holding the p key on the new keyboard, plus you can paste text into a tweet by holding .?123 and pressing v.