Now there is "bonus point" in RU league competitions.
Getting 4 tries means 1 bonus point, and defeat by less than 7 means 1 bonus point.
But I think that this is a very bad system.
Look at the 2011 World Cup Pool D. The last game was Wales vs. Fiji. RSA's 1st finish had already been decided. Wales needed only 1 point to finish 2nd. And Wales got 1 point by 4 tries in the 1st half. That actually meant the end of the game in the 1st half.
Bonus point makes such a situation.
There is no need for bonus point, since there is point difference. There is no bonus point in 6-Nations.