Thank you for your endless energy!
I can confirm that the developer options bug isn't occuring any longer. Don't know if it is due to your implementation of the LOS setup wizzard, but although system and apps are configured I still have a message in statusbar wanting me to complete setup. When you click on it data transfer from an old device or backup is coming up. Same was happening with the release from 27th.
But it might be essential to know that I have BitGapps configured to use the Google setup wizzard. Maybe there's the conflict.
Everything else is working fine and smooth.