Nope. No hostnames. And there's nothing in pf.conf that sets up anything that DNS would need, anyway. My pf.conf is very simple (I'll send it by email to anyone who asks, but the security-dude in me says "don't post it to the public"), just setting up a few queues and a NAT for OpenVPN (which shouldn't matter). My machine is exposed to the net, nothing magical required.
Any other ideas?