Is there a plugin to show the code tag button on the visual editor?

There seem to be a few people scratching this itch over at the TinyMCE sourceforge tracker. http://sourceforge.net/tracker/?group_id=103281&atid=738747

This looks promising.. “CodeExtras adds <var> and <code> markup buttons – ID: 2904557″
http://sourceforge.net/tracker/?func=detail&aid=2904557&group_id=103281&atid=738747