There seems to be a huge increase in the last few years of teams deliberately giving away penalties, usually to get your defence set when your own your own tryline. While these are professional fouls and should be dealt with by a sin binning, it seems refs are to afraid to drop a team down to 12 players so only sin bin in try scoring situations (and even then it's 50/50). Maybe a system worth looking at is a yellow card system similar to soccer, in that if a ref feels you have deliberately given away a penalty (or keep giving away the same kind of penalty) he can give you a yellow card. Two yellow cards in a game equals time in the bin (extended to 15 minutes, 10 is to short, 20 to long). The cards can be accumulated from different games so that when you get 5 it's a one game suspension, another 5 after that is 3 game suspension, another 5 after that is 6 game suspension. Come the finals there's an amnesty and everyone goes back to zero as it would be unfair for a player to miss a semi or grandfinal for a yellow card given away in the early rounds. Sin bins would still be in place for professional fouls in a try scoring situation. Also yellow cards could be given for talking back to a ref, throwing balls at other players heads, general merkin behaviour that starts those ridiculous looking 'melees' and for slapping players.