When is yahoo gonna make it so we can block IM's, im tired of receiving IM's?

I want to be able to block people from IMming me, but if i block them , i can't see anyone in the room, except who is on my list. were tired of being IMMED to death by freaks We want to be able to block so no ims but i want to see people in the room, just don't want them imming me!!