Wow... I guess that confirms the answer is "no". I've noticed with Apple if there's a useful function it usually pops right out at you.
I searched the Apple support forums and similarly several people had asked about show notes for podcasts and similarly the posts never got responded to. Perhaps it's a conspiracy? "First rule of show notes, we don't talk about show notes..."
Anyway. I guess it's a minor thing. I'm curious if there's any sort of place to submit suggestions like this where Steve can ignore them. Probably just the Apple forums, huh?