infinite lease time

Hi. First of all thanks for this great project and specially for keeping the Perl library. I need to keep the IP address of the virtual machines the same as long as possible. dnsmasq provides a setting for lease time. It can be set to infinite, but not from within libvirt. I found this patch from 2016. https://listman.redhat.com/archives/libvir-list/2016-October/msg00561.html But it looks like it never made to libvirt. Some time ago I made it work changing dnsmasq/default.conf. Then we made it immutable with chattr. This no longer works because libvirt refuses to start dnsmasq unless it can write to it. Fair enough. I've seen I can add manual IP addresses as stated here: https://wiki.libvirt.org/page/Networking This is ok, but it would be a considerable amount of work, requiring lots of manual labour. Is there a way to set the lease time from libvirt ? Thank you !