I am currently working on a new feature called "Verbatim Mode" that will allow you to make sure that for certain feeds the data in our database (and in your digests!) is EXACTLY the same as that in your feed. This means those feeds will have no archive, but be a literal "copy". This will assist those users who are having issues updating posts and then wondering why our database does not update.
I will post again at the end of the night with progress.