From GDSFA By laws applying to the O35 competition:
4. Sliding Tackles Sliding tackles are not permitted in Over 35 games. For an infringement of this rule, the referee will award an indirect free kick. For repeated infringements of this rule, a player may be cautioned by the referee.
In normal time of a normal game, team receives a penalty, coach subs someone on to take the penalty, then subs him off after the penalty has been taken. I have asked officials and they ALL agree that: sub can be made as the ball is not in play, any player on the field can take the penalty, sub can be made after the penalty is taken as the ball in not in play again. So it is OK to do this. PLEASE if there is a rule on this could someone please post it here.