"Forgot Password" link missing if using External user management

We've connected our Confluence server to our Jira User database (which rocks!) however, users being users, they clicked "remember my password" for our Jira server a year ago and now that they have to log in to Confluence they don't know their password.

As you can imagine, I've had to tell quite a number of users that "I don't know their *(&W$%ing password."

It's unfortunate that they can't help themselves with the "forgot password" link they can use when logging into Jira because it seems that when Confluence is configured to use external user management this link is disabled.