Made a build with more frame layout options. Set the Layout to Large, and then you can change the size ratio between the two screens (like if you wanted the top screen to be 1.5x the bottom screen you'd set it to 3x | 2x). It's a bit funky though, if you try to set the secondary screen to be bigger than the primary screen it'll just make them both the same scale, so use swap screen if you want the small screen to be bigger. Plus added some extra resolution options no one will probably use. Also build provided is built with VS and not mingw so it'll be a bit slower than other posted builds.
Screenshot: http://i.imgur.com/lr48e7V.png
Download: http://www.mediafire.com/file/809ap9uqdudxg8f/Citra_frame-res.zip
Source: https://github.com/SonofUgly/citra/commits/master
Screenshot: http://i.imgur.com/lr48e7V.png
Download: http://www.mediafire.com/file/809ap9uqdudxg8f/Citra_frame-res.zip
Source: https://github.com/SonofUgly/citra/commits/master