How about using the URL metatag for something ?
eg. right or double click option for the artwork to open the URL if present.
If present, added to the info panel.
If the URL tag contains an RSS link, then use that to populate the info panel.
That way people can add the news feeds from the relevant band site or blog.
When downloading podcasts auto-add the feed URL to the metatag PODCASTURL.
Then when setting up on a fresh system for example, your old podcast collection can be used to repopulate the podcast section.
This could either be a tick box set for use during scanning your media as normal, or as an "Import Podcasts" option. eg. available when you right click on the root Podcast icon
This would help sync things for people that use multiple PCs with an external drive.