I think that it would be realy great if there were commands like /chat deathmessages on/off Toggle if all the deathmessages will come up in your chat. /chat pm on/off Toggle if pm from players will come up in your chat. /chat player on/off Toggle if normal players messages will come up in your chat. /chat staff on/off Toggle if staffs messages will come up in your chat
I get the idea of it its just that if players had that option then it wouldn't be the most practical thing ever because if a player or more importantly moderator was trying to contact you in-game and you had everything on mute consequently they wouldn't be able to tell you something that could possibly be important.
Because echo is silly. Of course this makes sense! By deathmessages he means like [player] killed [player]. I don't think the staff message toggle should be added because of the reasons @iRubTacos stated, but I think this is a very good idea filip.
It would also be good if you could toggle on and off things like item pickups to reduce the amount of chat spam when people are trying to communicate, of course that is if all of these ideas are even possible to implement into the existing player commands.