refactor2

system/optional/steam.nix

@@ -0,0 +1,27 @@
+{ config, lib, ...}: {
+
+  options.gaming.enable = lib.mkEnableOption "Enable steam and related software";
+
+  config = lib.mkIf config.gaming.enable {
+    programs = {
+      gamescope = {
+        enable = true;
+        capSysNice = true;
+      };
+
+      steam = {
+        enable = true;
+        gamescopeSession.enable = true;
+      };
+
+      gamemode.enable = true;
+    };
+
+    environment = {
+      systemPackages = with pkgs; [
+        mangohud
+        protonup
+      ];
+    };
+  };
+}