When starting a review, the normal process is add individual reviewers who then get sent an invite email.
What do people do when they want to send a broadcast email to a group of developers? Who ever is free then joins the review.
Since you may not know who is busy & the developers are spread across a continent it's difficult to just ask round the office.
What we do at the minute is use a dummy account mapped onto the developers mailing list but it means we waste a licence for every team. It's also different groups for different projects so we can't modify the email templates.