At 2FTS when flying the Macchi flaps were not deployed on down wind for a normal circuit, although they were for a low level circuit. Same for the PC9 until a couple of years ago. Why? Coz the Mirage doesn't have flaps, son!
When the RAAF got the squirrel the engine condition lever (I think that's what it was called) was replaced by twist grip throttle. Why? Coz the Iroquois has got a twist grip throttle, son!