Yup Noha - it IS so simple!
You can even test if it works by re-importing the category you just exported with your nametag on it - you'll then see your name under the category/playlist title in your word library! (just like an ID!)
And Nikki, to edit your existing uploads by adding your name to it, you will first have to export all your categories and playlists again, this stim eusing the Screen Name function.
It may require a little more hard work to do, but it can be worth it so that other people know you created all those wonderful library files!