There's no updated way of making changes. It's all trial & error. You can use the ModelViewer to see what args to use for a specific aircraft. My attached scene has a Viper, Hornet, and Tomcat in the hangar. You can modify it to your liking. FYI, I have specific liveries set in the file. I'm not sure what happens if you don't have those specific liveries installed. If the game doesn't load, you will have to change the liveries in the file.
sceneVR.lua