Cases Emails

Are you able change the from address on emails sent from the case. It always defaults to the main support email address. We only want this to be the from address in certain circumstances.

Generally, we want the from address to be the email address listed in the Set Preferences > User Profile > From Email, but this doesn't work unless we are sending the email directly from the customer record. This is not sufficient because we want the email attached to the case.

Has anyone figured out a workaround for this limitation? If not does anyone have an enhancement request # handy? I would call this an easy fix with a big benefit. We constantly have emails going to the wrong department because people are always replying and send the email to support.