Comment 4 for bug 922677

Yeah, I later discovered that changing to exit 0 will break resolv.conf with Network Manager.
Matt Trudel is aware of it and the Network Manager code will be changed to a logic similar to that of the dhclient hook (check for resolvconf and for /etc/resolv.conf being a symlink).

As for the debconf change, that was on the recommendation of Steve, so I assume that's fine. Maybe not the recommended way but certainly not the worst way of doing it either :)