Include Last Updated Tag in RSS Feed Items

A nice feature is being able to append .rss to the URL to get an RSS feed of a category or the latest topics in all categories.

Would it be possible to include the Atom atom:updated tag in each item in an RSS feed? This would be helpful for seeing when posts were last updated. Currently the RSS lastBuildDate tag is included for the entire channel, but there is no per-item last updated information.