Right now there's a field for Location, but it would be nice if there was an option to select country as well. An nice drop-down list with all known countries to select from, with default set to None for those not wanting to select one. This could then be utilized by mods to for example show a country flag in the userinfo etc.
Custom fields is that's what I currently use for this in vB, but I think it would be better to have this as a core function in a forum.
Not exactly sure why most forum software doesn't have it, as it seems like a pretty essential thing to have imo.