Hey Scirra, I have a bit of a suggestion, which is important now that fullscreen gaming has been encouraged.
If I am trying to make my game work fullscreen, I can see that many of my graphics are now too small, and are blurry when scaled up to fill the screen.
If I want to replace my graphics with identical graphics of a larger size, all of the sprites within the layout will of course suddenly blow up to a huge size, and these have to be manually resized back down to what they were before.
An option to preserve the original size on the layout of newly high-resolution graphics would be very welcome indeed!
The only problem I can see with this is what would happen if someone tried to replace the graphic with an image of a different aspect ratio.