Yeah, I grossly over-analyzed how to do it; when I thought outside the box with the demo code I had it just sort of clicked how easy it really was...
The "hard" part was where to put the report link yet have it stand out, so I just kind of suggested its current placement.
I also over-thought what to submit, then I figured that the only thing that really matters was their latest ip, so if a "last post ip" didn't exist then just grab the reg ip so no matter what it'd be their "last logged" ip address.
Have a couple little things I want to work in, but I went and reported this mod to them so that they could (hopefully) add it to their listing.
Let me know if you guys run into any oddities and I'll take a look. I'm thinking about building a separate (non UBB) script to do a one-time scan of user data, meant to be run on different days for large forums (to bypass the 5k limit) but I'll have that separate for those who want it.