
When NetworkManager is configured to not manage all interfaces, it's perfectly fine to have the rest be managed by the standard nixos wireless scripts. I use networking.networkmanager.unmanaged = [ "*" "except:type:wwan" "except:type:gsm" ]; to control everything using networking.wireless except for the mobile LTE modem which only works with NetworkManager.
*** 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.