I have some good news, and some bad news. The developer fixed the insufficient storage issue with OS integration, which is great. The bad news is, it won't work with paid apps due to the way Android handles them.
I don't know if this works, but if you have issues with Android killing Lux on Android 4.1+ and don't want the persistent notification, long press the notification and click the 'App Info' button. There should be a checkbox to disable notifications. I think that still retains the persistence. Would love to hear feedback.