I am working on the category restriction code right now 🙂 I’m adding global options to restrict all ads by categories and/or tags. I’m hoping to submit the first version of this feature tomorrow (Wednesday).
Can you give a few more details on what you mean by restricting by the URL being visited?
I’ll take a guess – If you want to restrict ads from a specific posts/page you can define the ‘disable_adverts’ custom field for the post/page to be the value ‘1’. Or you can insert a <!--NoAds--> tag into the page contents.
Hope this helps. Get back in contact if you need any more help.