I'm trying to think of a use case for addn-hosts in dnsgate. If the user is not using dnsmasq, then they are stuck with /etc/hosts, if they are using dnsmasq then they might as well use a dnsmasq syntax file so '--block-at-tld' can be used. dnsmasq.conf has an include syntax:

echo "conf-file=/etc/dnsgate/generated_blacklist.conf" >> /etc/dnsmasq.conf