You can add a "release: 2" line to the article markdown in case you fudged up a release and would like to increment the GUID in the feed after a fix
You can add a "published: false" line to the article markdown to NOT have it show up anywhere.
Feed with all items:
Examples for the category feed generation:
iTunes feed that uses m4a with a fallback to mp3 if there is no m4a for that episode
Note: You can also add a feed_size parameter and a page parameter to the URL ("?feed_size=4&page=3")