Yes im talking about Multiplayer, also yes this should be a option for the server admins. The idea is to make communication a little tricky for those planning to have faction wars and stuff, If you type stuff in chat it should not relay the message to everyone on the server, nor everyone on the server that its part of your team. It should at best be something that only people in the room you are in to listen and people on rooms nearby to know you talked but dont know exactly what you said. Then you can expand this and make Radios or other comunication device, so if you have one of these equipped what you type will be send to everyone who has a radio in their inventory (Not necessarily equipped), these should also be coded in way that if someone that its not on your team happens to steal your radio or decoded the frequency your team its talking, they would also listen to what you have said (making espionage possible) Interplanetary communications would be something more complex requiring a more expensive radio or a computer/something wired to a big antenna nearby.
