Only being able to talk to people in your server is kind of a pain. The ability to chat between servers through whisper would be convenient, a command to whisper somebody without having to lose your place in a tourney would be nice rather than hopping between rooms.
Example: /wp Fuze
The ability to start a whisper with multipe people like a conference would be a great feature aswell.

Thats actually a good idea you can talk to someone when in different rooms
One of my ideas was to use the buddy list also so you can click a buddy have a option to chat in whispers through a "Party"

-Supported

I'm sure that being able to /sa for a player would be very handy for this feature as well.

I believe you can already do that type /chat {servername}