Personally I'm glad they don't.. otherwise any state for which registration etc are done based on weight would probably start including those options in the vehicles stats, hence costing a few hungie extra a year ;)
Btw, if you have noticed that the weight of the 5 door models has disappeared from the current specs. My guess is because it'd cost $437 vs $306 to register the 5 door vs the 3 door for private use in NSW. For business use it'd be $650 for the 5 door and $450 for the 3 door (this is REGO only, not ctp etc).