FWIW, I think you're wrong
You can think anything you like, but this is not a matter of opinion. I linked to the actual official specification, please point out where that specification explicitly states that you must have a maximum of one enclosure per item.
The fact of the matter is that WordPress supports multiple enclosures per item. So does every other major blogging application. There is no easy way to prevent this from working, because it's a feature, not a bug.
As I said, each post will have a podcast which I produce and links to MP3 files (a requirement of the people providing music to me for my show); not different formats of the same content.
If those links are relative (instead of complete http: links), then WordPress won't turn them into enclosures. It only works with full links.
I'll mark the thread "resolved," but I'd like to recommend that rather than telling people they're doing it wrong; the developers of WP and plugins consider solutions to their users desires. Crazy idea, I know.
Telling people that they're doing it wrong is often the right answer. What, you'd prefer that we give you the wrong answer? For everything that you can do, there is a right way, and there is a wrong way.
And what the user "desires" is irrelevant, because the user often doesn't have the correct method in mind. He certainly has a goal in mind, but the correct route to that goal is often different than the user thinks.
