I gave this a second thought. Wouldn't this also be the key for some kind of portrait homescreen support? If there wouldnt be any distinct ancor points for the different views or even defined views at all, the canvas (eg. visible area) could be freely rotated at will.
Of course, when rotated, objects would only occupy the upper half of the screen since the native vertical resolution of the device (and thus the "height" of the area where object can be placed) is 480 pixels. But since the width would be a strip of 3200 pixels without any constraints otherwise - instead of 4x800 pixels as of now - it would not matter how much - widthwise - of the strip would be on screen. Intriguing...