save movie size?

Is it possible to save the size of a movie whilst using free resize (ctrl+num pad 8) as i'm using this to stretch widescreen movies (if there's an easier/better way plz tell me :D ) but when i exit full screen mode and then begin playing the movie again the movie is back to its normal setting and it shows up in the top half of the screen, is there a way around this?
i've tried all the "save...movie/aspect ratio/etc. settings" but they don't make a difference.
thanks