Our return vent for our hvac is right outside the master bedroom. The master bedroom gets very little airflow with the door shut.

It was recommended that we add secondary return duct in the master bedroom to combat the high static pressure that the house is under. 

I have a question though, would it be beneficial to put a vent in the wall between the master bedroom and living room to help ventilate air in and out of the room so there is not as much pressure in the master bedroom?