hi,
i was just wondering if it was posible to change a server setting and it not send a message to the client saying what it was that was changed?

also, i've just been asked by someone else if i know how to disable sounds and stream radio into the game, but i have no idea, apparently it can be done. any one know?

Not unless you hook it in some way if that's even possible. (as far as I know)

not sure what exactly you mean by the second question, I know streaming radio can be done through the MOTD or managed by mani with webshortcuts (i think?)
Disable sounds the same way as you enabled them only the other way around.