I only read about about this yesterday so thought I would post it. If you are a Horizons owner and have access to Beta then you could have 8 different game types to choose from in the launcher. If you add the command line option /edh to either a shortcut or to the ScreenShotChanger app launcher section then it will load up the ED Launcher with the blue interace and a cut down option list (only the live and beta Horizons options).
I've tried looking to see if there are any other command line options but so far not found anything.