There are certain players that realy like to spam a lot while they are on public servers.
And sometimes they just start spaming some random stuff like "GAYGAYGAYGAY"(gee i wonder who that might be? =) in teammesages every second (as much as the server allows them to).
So what I think is, that it would be very nice to have a player blocking feature.
Something like "block #3" to stop recieving any messages from player #3.
Or even better is being able to pass all messages through a script to be able to handle incoming messages the way I want.