Well, I just realized when my dhcp server machine went down, that I have a lot of services redundant or in failover mode, but unfortunately not dhcp. So I was looking for an easy way to do it, and one option was the pfSense machine (where I quickly put up a dhcp server with another address range as a quick fix).
Since I had that running, I wondered if I couldn't just use it on a more permanent basis. I understand from your reply, however, that the pfSense implementation was not meant for this. So I'll probably just take some other machine already running here.
Yes, it's something you shouldn't need for a home setup. Unless you are the only one who can fix such things in a family, and if you're at the same time away frequently for days or weeks even. And leaving the family with no working IT is not always something they appreciate.