initial attempt

modules/programs/default.nix

@@ -1,6 +1,8 @@
 { ... }:
 {
   imports = [
+    ./program_list.nix
+
     ./audio
     ./browsers
     ./development

modules/programs/program_list.nix

@@ -0,0 +1,27 @@
+{ config, pkgs, lib, ...}:
+let
+  addProgram = name: requiredCapabilities: extraConfig: {
+    options.custom.programs_list.${name} = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = "Enable ${name}";
+    };
+
+    config = lib.mkIf
+    (
+         (config.custom.programs.${name} or false)
+      && (builtins.all (capability: config.capabilities.${capability}.available or false) requiredCapabilities)
+    )
+    (
+        { environment.systemPackages = [ pkgs.${name} ]; }
+        // extraConfig
+    );
+  };
+
+  firefox = addProgram "firefox" [ "display" ];
+in
+{
+  imports = [
+    firefox
+  ];
+}