I know that you are trying to setup a user friendly lightweight distro, we have talked about this previously. I love your distro, and I love working with it.
I think dietpi.txt should have an option for pasting a ssh public key, at installation DietPi should create ssh keys for root and copy this public key to /root/.ssh/authorized_keys, and if there is an authorized key in this file root login by password can be disabled in /etc/default/dropbear with extra arg option “-g”.
When we setup static IP in dietpi.txt in the first run I saw in resolv.conf that the nameservers are 192.168.0.1 and 0.0.0.0, I think it would be better if you put another option for that or use opendns, etc as default dns servers.
I will update this as I run into requests