In my case, a copyright infringement forced me to take several episodes offline. I did that by deleting the mediafiles but leaving the episode posts.
If a listener wants to download a deleted episode, I want to show a short message that this media is offline on purpose and provide a link to more information.
At the moment, I'm doing this by checking the availiablity of an episode with a PHP script, which dynamically shows a message if needed. But Podlove can check the availiability by itself and using the template engine, it would be a more user-friendly approach.
I can understand, that this request is kind of special. But I don't think, it's uncommon to show some information if the media is offline wittingly.