Presuming sources start in a neutral state for EAX effects, that is they're not affected by EAX by default, there's no need to set an active EAX state for one until the app sets an EAX property on it. Since the deferred and immediate properties are stored independently per-version, they can always be set to defaults, and simply not have a particular version committed as active until the app sets an EAX property, which will inherently set the active version.