I'd like to add that, but I'm not sure how to add that as a static value....
Think about how much the list has changed over the past few years. In 2010, there was 3 categories of advents. Now there are 10. It kinda makes my head spin... Then there's always those "wild rares" like the RBM, Wolf PPS and lions that pop up once in a while that make it nearly to or on the list just by default. That will happen again as the years go by and there's yet another list (09) in the works, yes?
Then when you put up VR distinctions, won't the other rarities also want more distinction? How the heck would you gauge that...
Then remember that's three categories per tier because you have single variation, blanket and non dog. This is why I'm always hesitant about making a category. It's not just making one category, it's often tentatively increasing my work load exponentially, so it really needs to have a solid reason for adding.
Maybe that's something for a mini-list?

If someone wants to make an offshoot of the world records that goes that in depth to categories or wants to make a nitty gritty out of the bucket list that people have been requesting like records for each species, PPS by year or other crazy idea, go for it! but I really don't think I'll be able to maintain both lists at once. As it is, I need to set aside an hour just to update this list. Maybe we can get a collab up for a dual list where the other list goes more in-depth and this one remains a general list?