I'd like to stick my nose in here and say that I totally back up separating oval and road stats. I do use the stats from time to time to scope racers on servers I'm thinking about joining. I inevitably end up going, "Cool, this guy will be fun." Then... "Oh... oval racer..."
I think laps done accounts for more than speed. Races finished and won and 2nd and third tells a lot of the story. I like the stats.
I'll also take this opportunity to repeat my pitch for consistency stats. Extracted from all the laps times that are already recorded, a simple average would tell a lot about a driver. Putting oval consistency stats with road consistency stats would make the road stats worthless.