The command to enable unknown sources permission for an app with adb is,
adb shell appops set "package_name"(without quotes) REQUEST_INSTALL_PACKAGES allow
This way there is no need to get back to aidan for enabling unknown sources permission for an app
New Rom with a modified system image has been released by another developer in telegram group(
Group).
The Dev also plans to give a further update with more improvements(No ETA).
Main features of the rom are Gapps and persistent adb(i.e no need to go to settings editor app to enable again).