Ah, most editing programs do this by default, actually. Opening a file in textpad, notepad and TextEdit for example yields the same filename output when you ctrl+s. Never ask why when you clearly have not used "common" programs, or at least understood their functions at all too well.
There are a number of people, like me, who like this behaviour. It makes sense to me for it to be this way, it is unobtrusive as well as it is unassertive and has been this way since Adam was a boy. FileIN --> edit --> FileOut. Not FileIN --> edit --FileOut.Pages
Going over other forums has yielded an Info.plist (Open Package contents on the Pages application in Finder with TextPad/TextEdit etc) which worked as expected when one changed all Viewer entries to Editor for Pages'09. This latest iteration, however, has gotten sly and removed those entries... The search continues.