Something I am surprised isn't here, and haven't realized how useful it might be until recently.  We should have an option to MM everyone in a contact group.  Right now I have a group of 10 or so contacts that I will be MM'ing on a fairly regular basis, and unless I'm missing something I have to type out all of them in the "To" line every time I want to send them a message.  I feel like there should be a way to more easily MM all of them, rather than pull up the list of them, and type them all in individually, especially as the number will grow in the future.  

I definitely agree with this, my contacts have been very lackluster as far as being a feature goes but it would make things a lot better for a lot of different reasons really.

I think this has been suggested before, I don't quite remember what the outcome was of why it was not implemented but since we are bringing it back up again I would love to see this implemented if it is possible to be done.

Till something else is done, a way you could do it is to just copy the "To" line of the 10 members you want to consistently MM and paste it into a BA Thread for easy access. It's less tedious than typing or copy/pasting the members names one by one and adding the ;

This would be awesome if I could MM a group of contacts I created.