I configure mergerfs by hand in /etc/fstab as well due to plugin only configuring on the drive level, not the share level.
The mergerfsfolders plugin allows you to pool any folders now.
I don't think it's possible to configure snapraid by hand since the plugin owns the configuration file? So i just use the plugin to make configuration changes - all other snapraid administration is done via terminal.
That is true. The plugin would overwrite any changes. But why administration via the terminal? What is the plugin missing?