More often than not, when resizing a map frame interactively with the handles, I don't want the map to move, but it does in an attempt to stay centered (or at the same extent - depending on your settings). It would be nice if there were a keyboard shortcut or some way to treat the handles more like crop handles; keeping the map put, but revealing or hiding more of it when you drag the edges. Sort of like a graphics frame in InDesign, or a crop tool.