Flushing the resolution cache on each DHCP lease seems like a bad idea. I haven't read up the issues others have had yet. Will look into it later.
I've got almost everything on static DHCP reservations already so have ticked that. Annoyingly the notifications I would be interested in information on are the extra things that turn up... ie. will not be on the static dhcp list anyway. Small step in the right direction I guess.