I voted Yes, however that is if the model has a cockpit which you asked. Some models do not have a cockpit such as a Q-500 pylon Racer. I don't make cockpits for racers so no pilots there.
In my scale models I usually have a scale pilot of a sort. If it is a sport plane, I may have either and sometimes a REAL SPORTY pilot.
Far too many examples to show here but here are several:

OOPS: Edited to add: If you intend to fly any RC Scale event under AMA Competition Rules, do not forget this one: Both CL and RC:
>>>>"If the pilot is visible in flight in the prototype aircraft then a man-shaped dummy pilot of scale size and width must be visible in the model during flight. The dummy pilot figure will not be scored or considered in any way during Scale Judging. If the contestant wishes, he may present his model for Scale Judging without the pilot figure in place, and no downgrading will be done by the judges if he does so." <<<<

But notice that it has to be there in flight.