I've build a Mini Scout with ailerons. I've used a single servo in the fuselage, which works but isn't ideal because I have the ailerons some distance from the fuselage, which means I can only use half of the servo range. 9g servos are too bulky to fit in the wings. I have various 5g ones, but they're all cheap and lack precision. I'm not looking for anything fantastic, but these cheap ones are very imprecise and sort of jumpy. I just want relatively smooth control.