There is no such /etc/adduser.conf file — should I create it? Don not know how. 
Weird: I installed FreeBSD-13 on another computer, set up its user account, and got /usr/home/name for his assets, with ~/home symlink to the real user directory. Why is NomadBSD installation different?
20.2 chapter of the FreeBSD Handbook:
# service zfs start
to start the service according /etc/rc.conf — sure, but I am curious: what would happen if this service was turned off? Would that ruin the file system with an entire operating system? Or maybe just reset zpool, and eventually cancel the read-only access restriction?
Welcome back 
Studies did not lead to an answer, and cancellation of user’s dataset I set up by zfs destroy zroot/home/vladas did not restore access to the system. ZFS even found and destroyed my files and settings backed up in /usr/home/vladas (not linked from /home/vladas)! So I decided to reinstall NomadBSD in my laptop from USB. ZFS again, following the same dataset commands as previously:
# zfs create -v zroot/home
# zfs create -Pv zroot/home/vladas
This time successfully, cheers!