configure trackpoint speed and sensitivity

nixos/hardware-configuration.nix

@@ -1,6 +1,3 @@
-# Do not modify this file!  It was generated by ‘nixos-generate-config’
-# and may be overwritten by future invocations.  Please make changes
-# to /etc/nixos/configuration.nix instead.
 { config, lib, pkgs, ... }:
 
 {
@@ -33,4 +30,10 @@
 
   nix.maxJobs = lib.mkDefault 4;
   powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
+
+  hardware.trackpoint = {
+    enable = true;
+    sensitivity = 240;
+    speed = 160;
+  };
 }