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My main reason for adding this is the ability to turn off helpers altogether. If you are not using any of the special protocols, keeping them turned off is safest, and in case you do want to use them, it's best to configure them through the new CT target for your network topology. Perhaps some sane defaults for nixos can be examined in the future. This change has no impact if you don't touch the added options, so no need to adapt.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.