I don't think you can do this any more. At least I know I've tried it and the game told me I had to finish my currently-selected mission first... And the team didn't HAVE a currently-selected mission. I guess it might work if the team leader were in the zone, I don't know.
You can still do this, very handy trick for when a team leader says goodnight logs and the star gets past to someone new, who is buried in the level up screen, and he doesn't realize the whole team in talking to him and sending tells, asking him to pass the star or pick a mission.
I call it the Praetorian Syndrome