One user id, one password, one audit trail would be great for JIRA by supporting Wedgetail JCSI SSO.

I think JIRA uses OSUser or Seraph for the user authentication and maybe authorization. A corporation between Atlassian and Wedgetail will benefit both products. I can make an initial contact for you!

A result should be a best practice document "Wedgetail JCSI SSO integration in Atlassian JIRA".

Links:
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http://www.wedgetail.com/jcsi/sso/index.html

http://www.opensymphony.com/osuser/
http://opensource.atlassian.com/seraph/

http://forums.atlassian.com/thread.jspa?threadID=5621&tstart=0
http://jira.atlassian.com/browse/JRA-3912