I am an Avid supporter of calling out the Storm for many cheats over the years and still today...
But THIS issue is 100% not their fault, but the referees and NRL in general.
Every team does it, Melbourne just exploit it even more.
This should be a simple case of moving the play ball elsewhere and getting on with the game.
Also when a player has this "Cramp"..."sore toe" or whatever - TIMEOUT, till the ball is played at a location AWAY from the "Injured" player....the player then can have an auto 5 minutes sit on the sideline, to help iron out the serious "issue" and be taken as an interchange, if no interchange left, play with 12 men and I think we will see this problem reduce dramatically....