The most annoying, useless, f**king stupid penalty of them all is that hand on the ball penalty. Are they f**king serious?? Maybe if the ball pops out cause of the hand on the ball then go ahead and blow the whistle.
But the rule isn't 'you can't have a hand on the ball' it is 'no player shall deliberately delay the play the ball'. The application of this rule comes in many forms: hand on the ball; coming up with the leg; laying on the tackler; flopping; etc. If the player with the ball is on his feet and in a position to play the ball, and the other guy is stopping him from putting the ball on the ground, of course it deserves a penalty.
There aren't too many rules. The rules (as they are written) are very generic. But there are many applications of each rule. The problem at the moment, is that some application of the rules are applied over-zealously, others aren't applied at all. Some applications have very specific KPIs that are used by NRL referees in determining penalties. For example, 'lifting over the horizontal' is not a rule. The rule is 'the tackle places the player in a dangerous position'. The NRL refs only apply this rule if the tackler is over the horizontal - which is bullshit.
Each play needs to be considered on its own merits, and the appropriate rule applied (or not applied if so be the case). This Utopian theory of consistency will never be realised (especially while they have 2 referees per game) while they are trying to jam a square peg into a round hole.