diff --git a/modules/nixos/programs/gnome-session/default.nix b/modules/nixos/programs/gnome-session/default.nix
index 84b55851..8c387130 100644
--- a/modules/nixos/programs/gnome-session/default.nix
+++ b/modules/nixos/programs/gnome-session/default.nix
@@ -8,15 +8,22 @@
 let
   cfg = config.programs.gnome-session;
 
+  glibKeyfileFormat = pkgs.formats.ini {
+    listsAsDuplicateKeys = false;
+    mkKeyValue =
+      let
+        mkValueString = lib.generators.mkKeyValueDefault { };
+      in
+        k: v:
+          if lib.isList v then lib.concatStringsSep ";" v
+          else "${k}=${mkValueString v}";
+  };
+
   # The bulk of the work. Pretty much the main purpose of this module.
   sessionPackages = lib.mapAttrsToList
     (_: session:
       let
-        gnomeSession = ''
-          [GNOME Session]
-          Name=${session.fullName} session
-          RequiredComponents=${lib.concatStringsSep ";" session.requiredComponents};
-        '';
+        gnomeSession = glibKeyfileFormat.generate "session-${session.name}" session.settings;
 
         displaySession = ''
           [Desktop Entry]
@@ -50,13 +57,13 @@ let
               '')
             session.components;
       in
-      pkgs.runCommandLocal "${session.name}-desktop-session-files"
+      pkgs.runCommand "${session.name}-desktop-session-files"
         {
           env = {
             inherit (session) fullName;
           };
           inherit displaySession gnomeSession sessionScript;
-          passAsFile = [ "displaySession" "gnomeSession" "sessionScript" ];
+          passAsFile = [ "displaySession" "sessionScript" ];
           passthru.providedSessions = [ session.name ];
         }
         ''
@@ -65,8 +72,7 @@ let
           substituteAllInPlace "$SESSION_SCRIPT"
 
           GNOME_SESSION_FILE="$out/share/gnome-session/sessions/${session.name}.session"
-          install -Dm0644 "$gnomeSessionPath" "$GNOME_SESSION_FILE"
-          substituteAllInPlace "$GNOME_SESSION_FILE"
+          install -Dm0644 "$gnomeSession" "$GNOME_SESSION_FILE"
 
           DISPLAY_SESSION_FILE="$out/share/wayland-sessions/${session.name}.desktop"
           install -Dm0644 "$displaySessionPath" "$DISPLAY_SESSION_FILE"
@@ -116,7 +122,7 @@ in
 
     sessions = lib.mkOption {
       type = with lib.types; attrsOf (submoduleWith {
-        specialArgs = { inherit utils; };
+        specialArgs = { inherit utils glibKeyfileFormat; };
         modules = [ ./submodules/session-type.nix ];
       });
       description = ''
diff --git a/modules/nixos/programs/gnome-session/submodules/session-type.nix b/modules/nixos/programs/gnome-session/submodules/session-type.nix
index 0afa6a65..564bb488 100644
--- a/modules/nixos/programs/gnome-session/submodules/session-type.nix
+++ b/modules/nixos/programs/gnome-session/submodules/session-type.nix
@@ -1,6 +1,7 @@
-{ name, config, lib, utils, ... }:
+{ name, config, lib, utils, glibKeyfileFormat, ... }:
 
 let
+
   # For an updated list, see `menu/menu-spec.xml` from
   # https://gitlab.freedesktop.org/xdg/xdg-specs.
   validDesktopNames = [
@@ -136,6 +137,25 @@ in
       ];
     };
 
+    settings = lib.mkOption {
+      type = glibKeyfileFormat.type;
+      description = ''
+        Settings to be included to the gnome-session keyfile of the session.
+
+        Generally, you won't need to set this since the module will set the
+        common settings such as the `RequiredComponents=` key.
+      '';
+      example = lib.literalExpression ''
+        {
+          # A helper script to check if the session is runnable.
+          IsRunnableHelper = "''${lib.getExe' pkgs.niri "niri"} --validate config";
+
+          # A fallback session in case it failed.
+          FallbackSession = "gnome";
+        }
+      '';
+    };
+
     requiredComponents = lib.mkOption {
       type = with lib.types; listOf str;
       description = ''
@@ -205,5 +225,10 @@ in
       overrideStrategy = lib.mkForce "asDropin";
       wants = lib.mkDefault (builtins.map (c: "${c}.target") config.requiredComponents);
     };
+
+    settings."GNOME Session" = {
+      Name = "${config.fullName} session";
+      RequiredComponents = config.requiredComponents;
+    };
   };
 }