is there anyway that i can put an option in the members profile where they can unregister if they don't wish to be a member of my forum anymore...??

I am sure if you want to give them that option.. it is possible. I think it would be somewhat easy to do. Are you sure you want this to be this way, you could just set it up or inform them to pm you to be deleted. I mean yes having it this way would take away the extra time you would have to spend to delete them, but what if they do it by accident and they have a lot of posts and have to start all over hehe.. :)