So I am still using mhddfs (gonna look into unionfs) and was checking out my file permissions. During that process I noticed that I was able to chown any file/directory as non-privileged user to i.e. root:users and vice versa for shares under the mhddfs path (i.e. /media/mhddfs_guid).
Is this an added "bonus" of using mhddfs?
To be clear, a file owned by "root:users" under a share exported by mhddfs could be changed to be owned by "my_username:users" and vice versa. Verified with a clean OMV install.