Well there is still the news service which i dont think can be disabled and i dont know what effect it has by setting your updates to 0 minutes.
Why would you want to set your engine and virus definitions to manual ? as this can leave you without the latest virus definitions which make your system more insecure, and turning off the avast community feature means that any detections wont be sent to avast automatically. Default update for free is 240 min, minimum update setting is 120 min