I think this feature will be something we'll put a fee on, and say the fees would either burn the tokens or send them to our buyback wallet @poshtoken.wallet. So allowing anyone to choose a different form of payment would be unnecessary if they already have hive accounts.
Yeah even with the fees on both ends it's still something compared to nothing anywhere else. :D
Not sure about the last one, haven't looked into it much, maybe @brianoflondon can help you there.