Stratehm, does but i can't figure out how it works yet ,then again i really haven't tried to either.
https://bitcointalk.org/index.php?topic=611338.msg12489739#msg12489739Pfool explains there ^, I know you said balance, but the best you can do with a Proxy is what he says. His is the best proxy out there right now,Slush proxy was one of the first ones of it's kind , it does sux to use .