FiddlerCore is in essence a proxy and it doesn't really have the notion of webpage. When you think about it what you are trying to do is hard to define even inside the browser. A page could make multiple requests and some of these requests might repeat periodically. So there might be no "last" request after which the page has completely loaded.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items