Our company developed a flight training program for aspiring aerial target pilots. The intent of the program was to instill situational awarness. By this I mean, no matter in which direction the target was approaching the pilot we could safely control the airvehicle. We instructed the pilot to face the inbound aircraft. This attitude forced the pilot to place himself in the cockpit and fly through the manuvers. After repeated practise sessions the pilot remained in a stationary position with only slight neck movement to keep the target in visual contact.
This training sceranio came about only because a question arose from some of our customers. The pilots we hired were all experienced R/C pilots but no two had the same body language when flying. There body language triggered the question, which was, why do some of your pilots move about when others don't. We almost but not completely solved this situation bt adapting our training program.
The bottom line is, it should not matter how much you move about when flying your model but how safely you flly.