I think you can generate via template-custom
mkdir -p /etc/e-smith/templates-custom/etc/dnsmasq.conf
cd /etc/e-smith/templates-custom/etc/dnsmasq.conf
vi 31dhcp
dhcp-range=LanAssignedToDHCPRange,First.IP.Of.Range,Last.IP,Of,Range,Subnet.Mask.Of.Range,LeasingTimeInSeconds
example:
dhcp-range=eth0,192.168.16.10,192.168.16.90,255.255.255.0,86400
dhcp-range=eht0,192.168.16.150,192.168.16.180,255.255.255.0,86400
save the file then
expand-template /etc/dnsmasq.conf
and restart the service
Reference:
http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html
Search for --dhcp-range parameter
http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2014q4/009016.html