We should probably have more than just Male/Female/Unspecified for our gender options due to various reasons.
Some suggestions have been floated in this reddit discussion[1] which was primarily about Drupal although due to how we utilize this information with the magic words[2], I'm not all that sure how we could.
[1]. http://www.reddit.com/r/lgbt/comments/e2l2p/first_time_ive_seen_transgender_as_an_option_for/
[2]. http://www.mediawiki.org/wiki/Help:Magic_Words#Miscellaneous
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=30442
https://bugzilla.wikimedia.org/show_bug.cgi?id=31816