Special:UncategorizedPages from user selectable namespace

After using MediaWiki 1.9 for quite some time now at our work for internal
documentation, I came to a shocking realization a couple of days ago that
Special:Uncategorizedpages defaults to displaying only uncategorized pages in
the main namespace. Why is that? Also, am I missing something or is there no way
for me to display the uncategorized pages from other namespaces?