Fail Over LDAP Parameter

When Confluence can't find a value of a specific parameter set in "Directory Configuration" it will left the information empty. However, for some customer, they might use two parameters to stored the same type of information, for example e-mail.

This kind of scenario usually experienced by merger company that want to combine two LDAP into one.

It would be great if Confluence could have a fail over parameter, where it will use another parameter to fill the "e-mail" information if it could not find it in the primary parameter set.