No it doesn’t, it acts just like any other device you added to Harmony. So if you set one light button to be ‘Fwd’ on your emulated_roku device it just sends that code to HA which then responds by doing whatever you set up the corresponding automation to receiving a ‘Fwd’ command. Don’t set up anymore buttons and it has no more interaction with HA than that.
In fact, it’s more friendly when buggering about than emulated_hue because you don’t have to go through the detect process when you change things about.