What is a one sentence summary of your feature request?
A configuration of the root organisational unit is needed.
Please describe your idea in detail. What is your problem, why do you feel this idea is the best solution, etc.
A configuration of the root organisational unit is needed. So it is not allowed to create an OU under root OU, if the user has the user right to create OU (in general, to create OUs in another subtree inside the organisational structure).
How do you currently solve the challenges you have by not having this feature?
none, controlling by hand