Same here. We've worked around it but getting reference to the iframe that gets embedded in the write call and changing it's src attribute to include the page we want to scroll to.
$scribd_frame.attr('src', doc_url + '#outer_page_' + pageNumber);
$scribd_frame references the added iframe.
doc_url references the original src for the iframe that scribd set.
pageNumber is the page you want to scroll to.
It's all sort of hacky but works in a pinch.