How do you request a feature?

From Joomla! Documentation

You can request a feature here:

http://forum.joomla.org/index.php/board,38.0.html

or here:

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemBrowse&tracker_id=20

You will need to register at joomlacode.org to submit a feature request.