I dont remember this ever being suggested.
My idea is to have a little note on the my games page to show if a team member has posted a message in the game.
I think this is useful for people who play lots of teams games, it would save having to load up all the games and scroll down just to find out no one has said anything. It would also improve the team talk within the game. It would mean you would not play your go then scroll down to see you had done it all wrong.
Sorry if this has been suggested but i did not have time to search and i will have forgot it by the time i next get a chance to post.