VA, if I understand your question right, that you want to ignore certain posters. That option is already on this site. If you want to put someone on ignore, go into your private messages, scroll down, choose "Edit ignore list", and then enter whoever the person's name is that you want to ignore. Not only will that person not be able to send you a private message, but you also won't see their posts if you're surfing the forum.

I hope I'm understanding his question right, but this is how I do it, anyway.

Mitch