It's not really something I'm looking forward to, but I just thought about it. Some funny guys are going to come up with weird rankings. It's going to happen at some point.
What will be the limits of tolerance of OpiWiki concerning rankings? What about "Serial killers", "Conquerors", "Human tragedies" or "Pornstars" for example?
I would guess many of these would probably not be allowed, but then again, since your website partly bases itself on Wikipedia and that there are articles such as "List of serial killers by number of victims"...
Maybe it would be good to add a sentence or two about it on Help: Rankings before you begin to get weird requests. :P
"Serial killers", "Conquerors", or "Human tragedies" are not types of rankings we're willing to provide, that's for sure. So yes, it's a good idea to improve Help: Rankings. Will be done.
"Pornographic actresses" is theoretically a proper ranking. It's a profession after all. Obviously though we won't add this ranking anytime soon. We're too young...