The RFU requests clarification for the following:

Law 3.11(b)
A player who leaves a match because of injury or any other reason must not rejoin the match until the referee permits the player to return. The referee must not let a player return until ball is dead.

Law 5.7(e)
If time expires and the ball is not dead or an awarded scrum or lineout has not been completed, the referee allows play to continue until the next time that the ball becomes dead. The ball becomes dead when the referee would have awarded a scrum, lineout, an option to the non-offending team, drop out or after a conversion or successful penalty kick at goal. If a scrum has to be reset, the scrum has not been completed. If time expires and a mark, free kick or penalty kick is then awarded, the referee allows play to continue.

Law 8.3(f)
After the ball has been made dead. Advantage cannot be played after the ball has been made dead.

1. Team A have a player waiting to return from a temporary exclusion and the period of exclusion has expired. They kick the ball into touch. Team B wish to take a quick lineout. Does the referee allow the quick lineout or allow the player from Team A to return to the field?

2. Same scenario but a substitution has been asked for rather than the end of a temporary exclusion period.