It would be nice if there was an option to block or not accept whispers and PM's...so if you don't want to be bothered with them, you can choose to not accept them as default...and if users try to contact a user that way, they just get a message that say's "this user has chosen not to accept Whispers" or whatever.  When I hold chats, I have some users that only want to talk in the main chat window and don't want to be bothered with the other two options (whisper and PM requests).