I think some things should remain at the application-level, and this would be one of them.
Familiarity with the browser/OS is useful when navigating, and it would assist with this task in most cases.
(Also, I can't express why but I especially dislike the up/down toggle feature which will appear on some websites in an effort to make scrolling easier. I accept it would be beneficial if you wanted to go to the bottom of the page - I suppose that is why it exists.)