RE: Flaps going in opposite direction.
unless the guy is confusing ailerons with flaps I don't see how this could be anything other than 2 servos running flaps.
If that is the case, plug them into 2 seperate channels (assuming he has an extra channel). he has a futaba 9chp. this tx will support flaps no matter how they are mounted, no need to worry about horns or reversing servos or antyhing like that.