hello,
you are correct in what you found. the "aliases" key in config.lua defines the various RTMP app names that are accepted by the EMS. It is important to note that the only thing that aliases enables is additional app names, it does not provide "sandboxed" RTMP applications. So for example, if you have a live stream named Stream1, and RTMP app aliases of "live,app1,app2" then all of these links will work:
rtmp://IP/live/Stream1rtmp://IP/app1/Stream1rtmp://IP/app2/Stream1
Bryan