[JRutledge]

I have never called a T for that and I cannot imagine I would. The only way I could see this if the coach came onto the court and the player was clearly not hurt or clearly not in danger. But if they come onto the court without a "real" beckoning, then they are beckoned as a common sense application. Usually most coaches know if they come out on the court the player is going to be subbed for.

Peace