Since the flight pack comes with 5 perfectly good servos, and the 4*60 needs 5 servos, I would not buy a mini servo to save an ounce or so on a 7 pound model. If it was a 4 servo flight pack I might consider a lighter throttle servo.

I have a 4*60 awaiting its first flight. From everything I've heard about it, flaperons are totally unnecessary.