Twitter Feature: Mass tweet members of a List?

Hey! I'd been having this idea floating around in my head for a long while now, and the new Twitter Lists almost hit the nail on the head, but not quite.

I think there should be a feature, either added to Twitter Lists or made separately, where you can send mass tweets with one @[ListName]. It would probably need a new Command other than @ since it could be someone's username, but you get the point.

So for example, if I want one List to include my family, I might name the list "TheFam" then when I want to tweet all my family at the same time I can just type in [Command]TheFam, instead of taking up most of the 140 character space in the tweet box with usernames.

So basically, its pretty much like a mailing list...er....tweeting list.

P.S. It would probably be a good idea to add the option of selecting or un-selecting certain individuals from a given list before sending the mass text.