Well, root in this context means their root folder /var/sentora/hostdata/[username]/
You could edit or comment out the code in /etc/sentora/panel/modules/ftp_management/code/controller.ext.php and disable some of the other options.
You could edit or comment out the code in /etc/sentora/panel/modules/ftp_management/code/controller.ext.php and disable some of the other options.