This would be great! Storing more profile information is definitely part of the plan for v2 and yet another use case for a per user app with box storage fields. I'm wondering whether this kind of address specific information logically belongs more on the NFDomain (NFDomain allows the owner to set arbitrary user fields, limited to 64 fields today, but they are also moving to box storage for their new version; we could let users set something like `u.metapost.address.color` on their NFDomain app and read from there)