We have made the usage of team sounds (cover me, go go go etc.) much easier - you can see the sounds in the item menu and map keys to them. This is Gold-only.
When playing a team sound then an icon with your head is appearing on the left side of the screen of the other players so that they know who has played the sound. Also there is a spam filter which only allows playing a sound approximatelly each 5-10 seconds.