The ability to "Send as" a different user (if you have access to their mailbox) as opposed to the "Sent on behalf of %idfile%".
We often get executive assistants who send emails from their Executive's mail box and don't want their name to appear anywhere on the email.
Solution should be easy for end user. Avoid location changes (thinking locations should be obsolete anyways in this day and age) and be based out of the main mail8x.ntf template. I've used the ACLteambox template in the past to achieve this, but I shouldn't have to.