Well the thing is on SL , when you create a name , you automaticly get a flag based on your ip , so most of time its correct.
On TB is not working like that yet , but ppl are able to choose their own flag http://et.trackbase.net/index.php?mod=reserve

I already posted something about flags , let's see if thats possible to get flags for everyone like SL does.
then if ppl wanna change their flag .. they can edit their profile , simple as that.

Hope i answered to your question