As far as I know it doesn't relate to the adserver in any way. I am not sure if you mean "descendant of" or "interfaces with" by relate.
But adserver integration would be good. The classified-ads packages uses the CR.
I'd be ok with committing this to HEAD (since it's really not complete enough yet to go into oacs-4-6) but then there are several things in oacs-4-6 that I'd like to use that are not in HEAD...