You can quote anyone, or nobody, as you can see. What I don't like is that the quote bbcode is phrased "Originally Posted by". If we're quoting an off-site source, it would be nice to be able to use the quote tag without it appearing as if we're referring to a post within the thread.
You can modify the text of the quote itself once you see it in the editor. You can use your own lead in although it won't be automatic with the = sign.