There is an unidentified header option you can add if you want it in the media center gui.
By the way, if you have this option enabled and select an unidentified file it gives you an option to identify it. This takes you into the identification GUI which has been deprecated in this release. Just an entry point I guess you forgot about.
Re: Bad News - TheTVDB API v1 is going to be discontinued
I've been using the latest beta since release and on the whole it is working well. However, I've had a few occasions when the TV show identification just stops working. The background service is still running and movies are still identified, but TV shows are no longer identified. Restarting the service the shuffling the files restores operation.