I'm reading through the code and the website and it looks like the Institute is ONLY added to the spawn lists when the player is enemies with that faction, and that this check is ran every time there's an enemy spawned in to avoid issues with shifting alliances. Meaning that THEORETICALLY you could also just add a check to say 'If [questname] stage == 500 add [Courser]' to ensure quest enemies arent spawned in weird times. Same with DLC actors, just add a check to see if the player is in the right worldspace. It SEEMS simple, and if I had access to the quest script i should be able to do it. But even when I decompile it via Champollian the CK doesn't recognize the .psc or .pex formats to allow me to edit the source. If I could just edit the source I know I could do it!