Hmm, for me WYSIWYG works without the additional modifications.
I just typed (in WYSIWYG, autoaprse was checked)
Code:
http://www.foobar.com
and it did not parse it.
Did you paste a URL? AFAIK there is no way to stop this from "parsing" (at least not at server-side), as this already generates <a> Tags in the Text submitted by the User, eg. the Server does not even have to detect the Links.