I agree with you that a page moving solution would be a great feature.
But - from what I think (I could be wrong though ;-)), it`s not yet
implemented because it's far more complex to implement for a flat file
based wiki system than just using the current manual multi-step
procedure.
There is a nice plugin named "pagemove" that works quite well: It moves the
page to a new name or namespace, corrects all backlinks and corrects the
media links on the moved page. I even extended it to move the media files
together with the page.
