Change reply-to address

From Derek Diget (MI):

 I would like to change/set the Reply-To email address in bulk messaging center messages.  I added two addresses to my profile, but I don't see where I can select what address to use when creating a new message.  Is it possible to do this?  If not, could I request a new feature request to do so.

Use case: I use a unique email address for each Competition so that I can route/filter correspondence (sent and received) for that event.  This allows a shared mailbox for use with others I may be working with for that competition.