Working on a Wordpress plugin. It is in beta.

The new plugin is called All Category SEO Updater. It works in tandem with the All In One SEO Pack and it allows you to update category titles, meta descriptions, meta keywords, h1 text, and category descriptions.

I just put up the files along with some specs. You can input your two cents by adding it to your Wordpress installation and getting back to me. Check out All Category SEO Updater.