NFSv4, Kerberos and files ownership on a shared filesystem

[AchilleTalon]

I have a NFSv4 environment using MIT Kerberos to manage authentication/access to shared filesystems.

I have a filesystem exported read-write to a client, this client is mounting the filesystem read-write. I can perform the expected operations with a regular user. So far, so good.

Now, my question/problem is what about an application creating/writing files into that filesystem which need to change the ownership of the files to a generic user with no right to login on the client, neither on the server. The no_root-squash option seems not to work for the root user being recognized as root on both sides. Do I need to create a principal for root in Kerberos or can I just create a principal for the user with no right to login? Am I trying to do something unfeasible?
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Achille Talon Hop!