Autoupdate permission when ran as system-app?

I dont know if that is possible, but afaik an app ran as a system app has access to special permissions, which Droid-ify could use. These would only be executed if a "/system/priv-app/" check has a positive result. There are (poorly) many reasons to not root a device, but autoupdates are essential for usability. The app could be pushed to the right folder using ADB without root.