http://www.australianrugbyleague.com.au/files/ARL International Laws of the Game 2010.pdf
I can't see anything about scrums to restart play when the ball hits the referee.
6.3) A try is scored when:
a) A player first grounds the ball in his opponents' in-goal, provided that he is not in touch or touch-in-goal or on or over the dead-ball-line.
b) Opposing players simultaneously ground the ball in the in-goal area provided that the attacking player is not in touch or touch-in-goal or not on or over the dead-ball line.
c) A tackled player's momentum carries him into the opponents' in-goal where he grounds the ball even if the ball has first touched the ground in the field-of-play but provided that when the ball crosses the goal-line the player is not in touch or touch-in-goal or on or ver the dead-ball line.
d) The Referee awards a penalty try which he may do if, in his opinion, a try would have been scored but for the unfair play of the defending team. A penalty try is awarded between the goal-posts irrespective of where the offence occurred.
e) An attacking player carrying the ball comes into contact with the Referee or Touch-Judge or an encroaching spectator in the opponents' in-goal and play is thereby irregularly affected.
8.1 The Referee must carry a whistle which he shall blow whistle to commence and terminate each half of the game.
Except for these occasions the blowing of the whistle shall temporarily stop the play.
The Referee shall blow the whistle:
(a) when a try or a goal has been scored
(b) when the ball has gone out of play
(c) when restarting play, other than at a scrum
(d) when he detects a breach of the Laws of the Game, except when to stop the play would be to the disadvantage of the non-offending team
(e) when play is irregularly affected by the ball or the player carrying the ball coming into contact with the Referee, a Touch Judge, or with any person not taking part in the match or with any object which should not normally be on the playing field
(f) when any irregularity, not provided for in these Laws, occurs and one team unjustifiably gains an advantage
(g) when a stoppage is necessary in order to enforce the Laws or for any other reason.
8.4) The game is restarted with drop-out by a defending player from the centre of his goal-line if:
a) A defending player last touches the ball before it goes over the dead-ball line or touch-in-goal.
b) A defending player accidentally infringes in the in-goal area.
c) A defending player touches down in the in-goal area.
d) A defending player in possession is tackled in the in-goal area.
e) A defending player kicks the ball into touch on the full from his own in-goal.
f) The ball or a defending player carrying the ball touches the Referee, a Touch-Judge, or an encroaching spectator in the in-goal area and play is thereby irregularly affected.
g) The ball goes over the dead-ball line or into touch-in-goal other than on the full from a kick-off from the centre of the half-way line without being touched by or touching a defending player.