i think you can use, action, system: set canvas size for this,
you can do this on start of layout..
this is also a way to control resolution, if you use fullscreen scaling, the smaller you set the canvas,
well obviously the smaller the resolution will be, but it will still use fullscreen, so a small canvas will have a pixelated look,
a higher canvas will look sharper
you will probably run in the same old, what about different orientation, screensizes, euhm do a forumsearch