I'm working with the profile page now, I'm thinking of just working with the "last post ip", "registration ip" (as the reg ip will be populated if they've never posted before), and the "real" email; I'm going to leave the username check (and pdn checked against that), the "public" email fields alone as to stay below their limitation of how many lookups you can do per day.
I'll likely tackle the reg queue the same way, but I'll need to work with it a bit..