I noticed that this plugin doesn't have support for editable regions in templates which I found really weird.
We use mailchimp with a hand full of regions and I thought it would be great to add to this so I went ahead and hacked it up a bit and got it working.
To get this working simply copy the code from: http://pastebin.com/VMxkMSFS
And replace the static function sendEmail on line 1665
then to pass it the $html array is just the editable region and the content so
$html = array('message' => 'Blah Blah');
Now I haven't done a ton of testing on this but so far its letting my regular e-mails and my special array emails through and its working so YAY!
For people wanting to see what I exactly changed its around line 113-161 of that pastebin