nixos/modules/system/keyd.nix

{
  lib,
  config,
  ...
}: {
  config = lib.mkIf config.fireproof.desktop.enable {
    services.keyd = {
      enable = lib.mkDefault true;
      keyboards.mouse = {
        ids = [
          "046d:c051:4ae65a29" # Work mouse
          "046d:407f:ee6ee407" # Home mouse
        ];
        settings = {
          main = {
            # Bind mouse-back to meta if held
            mouse1 = "overload(meta, mouse1)";
          };
        };
      };
    };
  };
}