it would be great if in the "Add User" dialogue we could tell Jira an Active Directory username, in either "domain\username", "username@domain", or "username" format, and have Jira query AD for the user's common name and email address as needed.

NOTE: I'm not requesting that Jira query AD once and store the auxiliary information but rather that Jira query AD each time the data is needed, this way if the data changes Jira stays dynamic.