No.
Instead of binding a key to say_team, which is utterly useless because if you say "Tyrant spotted!" you've got the riflers in the window room freaking out when the Tyrant is at the four door room. You'd bind a key to say_near "Tyrant spotted." and then only the people close to you, within a certain range, would see the chat. An ingame fireteam system would be useful, too, with the addition of say_fireteam. It'd only talk to the fireteam, which would be close to you, anyway.
I found that to be fairly obvious by reading his post. Did you read his post?
Hey! You b*stard! Ninja editing, making me look like an idiot.
*points to siggy*