numerical_minefield is now editable

config.cpp

@@ -2340,7 +2340,8 @@ EX int config3 = addHook(hooks_configfile, 100, [] {
   addsaver(vid.fixed_facing_dir, "fixed facing dir", 90);
   param_b(vid.fixed_yz, "fixed YZ", true);
   param_b(frustum_culling, "frustum_culling");
-  param_b(numerical_minefield, "numerical_minefield");
+  param_b(numerical_minefield, "numerical_minefield")
+  ->editable("display mine counts numerically", 'n');
   param_b(dont_display_minecount, "dont_display_minecount");
   param_b(draw_sky, "draw sky", true);
   param_f(linepatterns::parallel_count, "parallel_count")

help.cpp

@@ -547,6 +547,8 @@ void addMinefieldExplanation(string& s) {
 #else
   s += XLAT("Known mines may be marked by touching while in drag mode. Your allies won't step on marked mines.");
 #endif
+
+  help_extensions.push_back(help_extension{'n', XLAT("toggle numerical display"), [] () { numerical_minefield = !numerical_minefield; }});
   }
 
 EX string generateHelpForWall(eWall w) {