Well then, it's not the marshaller I'm refering to. It's the guy that follows you when pushing back. (wingman or whatever)
Well, you said marshaller, I assumed it was the marshaller.
No, the position the Wingwalker ( in fact, he does double duty as Wingwalker and Headset operator ) cannot be customized, it should probably be something to add to the airplane editor, but more than a position, it should be a distance, because the actual position is affected by the path taken during the pushback, so it won't always be the same and it won't even be always on the same side.