Concerning the comment that automatic updating will always ask you if additional permissions are required I found this in a search:
From the support.google.com page on "review app permissions":
When an app updates, it may need to use additional capabilities or information controlled by permissions.
If you have automatic updates enabled, you won't need to review or accept these permissions as long as they are included in a permissions group you already accepted for that app.
So, if your notepad app requests "cameraµphone/record audio", then a later update includes "cameraµphone/record video" or take pictuies, you won't get prompted when you click the update button.
I think that I'll stick with manual updates for now.