Perhaps a bit off topic, but why isn't a "stretch" mode possible or important enough to be implemented for the scaling modes? By "stretch" i mean, that the exact area of the layout you define in the layout editor would be shown, just stretched over all of the available screen space.
I could see this being extremely helpful for mobile applications, where you have to deal with a surprisingly wide variety of screen resolutions and aspect ratios. Or i could just be honest and say that this feature would help numerous lazy developers in making a game, without having to worry about the part of layout that's visible to user (moving/scaling GUI elements is a pain in a certain place i shall not name) or black bars around the screen (e.g. wasted space that looks unprofessional), at the expense of slight visual artifacts, such as round objects being elliptic...