As of WP 1.5.1-alpha nightly, the default rss, rss2 and atom templates do not include sections for adding images or favicons. For example, I'd like to add an image section to my feed like so:
<title>My blog title.</title>
However, I'd have to edit the default templates in WordPress. I'd very much like the ability to have files such as 'rss.php', 'rss2.php', and 'atom.php' in ones theme directory so these fields can be added without mucking with the default themes.
If there's another way to do this though, I'm all ears.