diff --git a/flake.lock b/flake.lock
index e3ba096..c06624a 100644
--- a/flake.lock
+++ b/flake.lock
@@ -170,11 +170,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1687204608,
-        "narHash": "sha256-rZ0e0iAIQM7vlsMd2/pcGfymZzNBRawObFgqIpxE94c=",
+        "lastModified": 1687421788,
+        "narHash": "sha256-CgoHjiUBnru0bV4PE8z1R6ZD9KeWtuAaUkyYWYJmQUE=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "f06a43dca05fb7f1aa44742bf861d9c827b45122",
+        "rev": "a4817894576f9cd01d784e60a0bfb143c81fc2be",
         "type": "github"
       },
       "original": {
@@ -471,11 +471,11 @@
         "nixpkgs-stable": "nixpkgs-stable_2"
       },
       "locked": {
-        "lastModified": 1687058111,
-        "narHash": "sha256-xDSn/APfAdJinHV4reTfplX5XnLsJSGdVwHpmdgP9Mo=",
+        "lastModified": 1687398569,
+        "narHash": "sha256-e/umuIKFcFtZtWeX369Hbdt9r+GQ48moDmlTcyHWL28=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "1634d2da53f079e7f5924efa7a96511cd9596f81",
+        "rev": "2ff6973350682f8d16371f8c071a304b8067f192",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index cd7ab93..b116fdd 100644
--- a/flake.nix
+++ b/flake.nix
@@ -47,7 +47,6 @@
       url = "gitlab:simple-nixos-mailserver/nixos-mailserver";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-
   };
 
   outputs =
@@ -74,6 +73,8 @@
       };
       hydraJobs = self.packages;
       formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.nixpkgs-fmt;
+
+      overlays.default = import ./overlays;
       nixosConfigurations = {
         thinkpad = nixpkgs.lib.nixosSystem {
           system = "x86_64-linux";
@@ -89,6 +90,7 @@
             impermanence.nixosModules.impermanence
             lanzaboote.nixosModules.lanzaboote
             {
+              nixpkgs.overlays = [ self.overlays.default ];
               home-manager.extraSpecialArgs = attrs;
               home-manager.users.rouven = {
                 imports = [
diff --git a/hosts/nuc/default.nix b/hosts/nuc/default.nix
index 325919d..aa2a3e8 100644
--- a/hosts/nuc/default.nix
+++ b/hosts/nuc/default.nix
@@ -22,7 +22,6 @@
   };
   services.btrfs.autoScrub.enable = true;
   nix.settings = {
-    cores = 3;
     auto-optimise-store = true;
   };
 
diff --git a/hosts/thinkpad/default.nix b/hosts/thinkpad/default.nix
index 841d529..4257d7d 100755
--- a/hosts/thinkpad/default.nix
+++ b/hosts/thinkpad/default.nix
@@ -32,7 +32,7 @@
       experimental-features = [ "nix-command" "flakes" ];
       auto-optimise-store = true;
       substituters = [
-        "ssh-ng://nuc.lan"
+        "ssh://nuc.lan"
       ];
       trusted-public-keys = [
         "nuc.lan:a9UkVw3AizAKCER1CfNGhx8UOMF4t4UGE3GJ9dmHwJc="
@@ -47,7 +47,7 @@
         hostName = "nuc.lan";
         system = "x86_64-linux";
         protocol = "ssh-ng";
-        maxJobs = 2;
+        maxJobs = 4;
         speedFactor = 1;
         supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
         mandatoryFeatures = [ ];
diff --git a/overlays/default.nix b/overlays/default.nix
new file mode 100644
index 0000000..f0a0d6c
--- /dev/null
+++ b/overlays/default.nix
@@ -0,0 +1,33 @@
+_final: prev:
+let
+  inherit (prev) callPackage;
+in
+{
+  wpa_supplicant_gui = prev.wpa_supplicant_gui.overrideAttrs
+    (old: {
+      # better desktop application name. "wpa_gui" kinda sucks
+      postInstall = old.postInstall + ''
+
+        substituteInPlace $out/share/applications/wpa_gui.desktop --replace "Name=wpa_gui" "Name=Manage Wifi"
+      '';
+    });
+
+  pcmanfm = prev.pcmanfm.overrideAttrs (_: {
+    # remove deskop preferences shortcut
+    postInstall = ''
+      rm $out/share/applications/pcmanfm-desktop-pref.desktop
+    '';
+  });
+
+  wdisplays = prev.wdisplays.overrideAttrs (_: {
+    # better desktop application name.
+    postInstall = ''
+
+       substituteInPlace $out/share/applications/network.cycles.wdisplays.desktop --replace "Name=wdisplays" "Name=Manage Displays"
+      '';
+  });
+
+  pww = callPackage ../pkgs/pww { };
+  jmri = callPackage ../pkgs/jmri { };
+  adguardian-term = callPackage ../pkgs/adguardian-term { };
+}
diff --git a/users/rouven/modules/packages.nix b/users/rouven/modules/packages.nix
index 071187b..431e033 100644
--- a/users/rouven/modules/packages.nix
+++ b/users/rouven/modules/packages.nix
@@ -3,13 +3,7 @@
   home.packages = with pkgs; [
 
     # essentials
-    (wpa_supplicant_gui.overrideAttrs (prev: {
-      # better desktop application name. "wpa_gui" kinda sucks
-      postInstall = prev.postInstall + ''
-
-       substituteInPlace $out/share/applications/wpa_gui.desktop --replace "Name=wpa_gui" "Name=Manage Wifi"
-      '';
-    })) # manage wifi
+    wpa_supplicant_gui
     pcmanfm
     xdg-utils # used for xdg-open
     snapper-gui
@@ -62,7 +56,7 @@
     rustfmt
     clippy
     gcc
-    self.packages.x86_64-linux.adguardian-term
+    adguardian-term
 
     # libs
     libyubikey
diff --git a/users/rouven/modules/sway/session.nix b/users/rouven/modules/sway/session.nix
index 516b9ef..89836d1 100644
--- a/users/rouven/modules/sway/session.nix
+++ b/users/rouven/modules/sway/session.nix
@@ -5,6 +5,7 @@
     wl-clipboard
     swaynotificationcenter
     playerctl
+    wdisplays
   ];
 
   services.swayidle = {
diff --git a/users/rouven/modules/sway/waybar.nix b/users/rouven/modules/sway/waybar.nix
index 9b718f2..ec6101e 100644
--- a/users/rouven/modules/sway/waybar.nix
+++ b/users/rouven/modules/sway/waybar.nix
@@ -1,4 +1,4 @@
-{ self, config, pkgs, lib, ... }:
+{ config, pkgs, lib, ... }:
 {
   systemd.user.services.waybar.Service.Environment = "PATH=${pkgs.swaynotificationcenter}/bin";
   programs.waybar = {
@@ -55,7 +55,7 @@
           format = "  {}";
           max-length = 80;
           return-type = "json";
-          exec = "${lib.getExe self.packages.x86_64-linux.pww} -w spotifyd:title -p None 2> /dev/null";
+          exec = "${lib.getExe pkgs.pww} -w spotifyd:title -p None 2> /dev/null";
         };
         cpu = {
           format = "{usage}% ";
@@ -68,8 +68,8 @@
         };
         pulseaudio = {
           format = "{volume}% {icon} {format_source}";
-          format-bluetooth = "{volume}% {icon} {format_source} ";
-          format-bluetooth-muted = " {icon} {format_source}";
+          format-bluetooth = "{volume}% {icon}  {format_source} ";
+          format-bluetooth-muted = " {icon}  {format_source}";
           format-muted = "󰝟 {format_source}";
           format-source = " {volume}% ";
           format-source-muted = " ";