From reading the forums, I've managed to customize my main/home page meta tags using the meta_tags.php files. I'm also doing just fine assigning page-specific meta tags through Admin for all the others.

However, I noticed tonight that Zen is automatically tacking the keywords that I had set for the main/home page meta tag onto the end of each of the page-specific keyword metas. Is there a way to stop it from doing this? It doesn't add anything from the main/home page metas on to the page-specific title or description, just the keywords list.