more cleanup

modules/nixos/boot/systemd-boot/default.nix

@@ -1,12 +1,14 @@
 { config, lib, namespace, ... }:
 with lib;
 let
-  # inherit (lib.${namespace}) mkOpt;
+  inherit (lib.${namespace}) mkOpt;
   cfg = config.${namespace}.boot.systemd-boot;
 in
 {
   options.${namespace}.boot.systemd-boot = {
     enable = mkEnableOption "enable systemd-boot";
+
+    configLimit = mkOpt types.int 10 "Number of boot items to keep";
   };
 
   config = mkIf cfg.enable {
@@ -14,7 +16,7 @@ in
       loader = {
         systemd-boot = {
           enable = mkDefault true;
-          configurationLimit = mkDefault 10;
+          configurationLimit = cfg.configLimit;
         };
 
         efi = {