Interesting and good improvement to the Laws of the game as it was really not in the spirit of the game.
Whilst I am sure most clubs either used or at least considered the use of this tactic if my memory is correct I seem to recall both Wigan especially Tomkins and Castleford mainly Gale were the main users of this ploy, which says a lot about the coaching methods. I assume McDermott was either against exploiting this or perhaps he never quite got the hang of it?