Let’s just say I have this scene… and I want to assign a couple of lamps to a specific world with Ambient Occlusion… but I want to put other lamps on a world without Ambient Occlusion. This is sort of a weird question, but can it be done?
Can you be clearer on exactly you want. If you want to combine renders from a scene with AO and one without you can use multiple scenes and the compositor. Without a clear description (blend file, examples etc) from you of your intended result I can only guess.