See http://www.teaser.fr/~amajorel/wesnoth/

diff -urN wesnoth-1.8.2/src/cheat.hpp wesnoth-1.8.2-aym1/src/cheat.hpp
--- wesnoth-1.8.2/src/cheat.hpp	1970-01-01 01:00:00.000000000 +0100
+++ wesnoth-1.8.2-aym1/src/cheat.hpp	2010-07-01 14:56:27.000000000 +0200
@@ -0,0 +1,118 @@
+/*
+ *	cheat.hpp - cheats for BfW
+ *	AYM 2010-07-01
+ */
+
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <string>
+#include <vector>
+
+
+/* Include cheat.hpp once in every source file that needs cheats. Call
+   cheat_init() before each use of any of the variables below. The parsing will
+   be run once per source file that includes cheat.hpp. */
+
+static const char	cheat_deathless_sides_name[]	= "DEATHLESS_SIDES";
+static const char	cheat_deathless_team_name[]	= "DEATHLESS_TEAM";
+static const char	cheat_traits_name[]		= "TRAITS";
+
+static long		 cheat_deathless_sides_bitmap	= 1 << 31;
+static const char	*cheat_deathless_team_inval	= "";
+static const char	*cheat_deathless_team		= cheat_deathless_team_inval;
+static std::vector<std::string>
+			 cheat_traits;	// $TRAITS
+
+
+static void cheat_init ()
+{
+  /* Parse $DEATHLESS_SIDES */
+  if (cheat_deathless_sides_bitmap == 1 << 31)
+  {
+    const char *s = getenv (cheat_deathless_sides_name);
+    cheat_deathless_sides_bitmap = 0;
+    if (s == NULL)
+    {
+      fprintf (stderr, "cheat_init: %s not set\n", cheat_deathless_sides_name);
+    }
+    else
+    {
+      fprintf (stderr, "cheat_init: %s set to \"%s\"\n", cheat_deathless_sides_name, s);
+      for (const char *p = s; *p != '\0';)
+      {
+	char *p2;
+	errno = 0;
+	long n = strtol (p, &p2, 0);
+	if (errno != 0)
+	{
+	  fprintf (stderr, "cheat_init: %s(%d): %s\n", cheat_deathless_sides_name, int (p - s), strerror (errno));
+	  break;
+	}
+	fprintf (stderr, "cheat_init: %s(%d): parsed \"%.*s\" as %ld\n", cheat_deathless_sides_name, int (p - s), int (p2 - p), p, n);
+	if (n < 1)
+	  fprintf (stderr, "cheat_init: %s(%d): side# < 1 (%ld)\n", cheat_deathless_sides_name, int (p - s), n);
+	else if (n >= 31)
+	  fprintf (stderr, "cheat_init: %s(%d): side# >= 31 (%ld)\n", cheat_deathless_sides_name, int (p - s), n);
+	else
+	  cheat_deathless_sides_bitmap |= (1 << n);
+	p = p2;
+	while (*p == ',' || isspace (*p))
+	  p++;
+      }
+      fprintf (stderr, "cheat_init: %s: %#lx\n", cheat_deathless_sides_name, cheat_deathless_sides_bitmap);
+    }
+  }
+
+  if (cheat_deathless_team == cheat_deathless_team_inval)
+  {
+    cheat_deathless_team = getenv (cheat_deathless_team_name);
+    if (cheat_deathless_team == NULL)
+      fprintf (stderr, "cheat_init: %s not set\n", cheat_deathless_team_name);
+    else
+      fprintf (stderr, "cheat_init: %s set to \"%s\"\n", cheat_deathless_team_name, cheat_deathless_team);
+  }
+
+  /* Parse $TRAITS */
+  static bool parsed_traits = false;
+  if (! parsed_traits)
+  {
+    const char *s = getenv (cheat_traits_name);
+    if (s == NULL)
+    {
+      fprintf (stderr, "cheat_init: %s not set\n", cheat_traits_name);
+    }
+    else
+    {
+      fprintf (stderr, "cheat_init: %s set to \"%s\"\n", cheat_traits_name, s);
+      const char *tokstart = 0;
+      for (const char *p = s; ; p++)
+      {
+	if (*p == '\0' || *p == ',' || isspace (*p))
+	{
+	  if (tokstart != 0)
+	  {
+	    fprintf (stderr, "cheat_init: %s: \"%.*s\"\n", cheat_traits_name, p - tokstart, tokstart);
+	    std::string t (tokstart, p - tokstart);
+	    cheat_traits.push_back (t);
+	    tokstart = 0;
+	  }
+	  if (*p == '\0')
+	    break;
+	}
+	else
+	{
+	  if (tokstart == 0)
+	    tokstart = p;
+	}
+      }
+    }
+    parsed_traits = true;
+  }
+
+}
+
+
diff -urN wesnoth-1.8.2/src/game.cpp wesnoth-1.8.2-aym1/src/game.cpp
--- wesnoth-1.8.2/src/game.cpp	2010-05-01 01:22:12.000000000 +0200
+++ wesnoth-1.8.2-aym1/src/game.cpp	2010-07-01 23:33:16.000000000 +0200
@@ -1241,7 +1241,7 @@
 			std::vector<std::string> chat;
 			config game_data;
 
-			const mp::controller cntr = mp::CNTR_LOCAL;
+			const mp::controller cntr = mp::CNTR_COMPUTER;
 
 			mp::start_local_game(disp(), game_config(), cntr);
 
diff -urN wesnoth-1.8.2/src/unit.cpp wesnoth-1.8.2-aym1/src/unit.cpp
--- wesnoth-1.8.2/src/unit.cpp	2010-05-25 23:20:10.000000000 +0200
+++ wesnoth-1.8.2-aym1/src/unit.cpp	2010-07-04 00:09:52.000000000 +0200
@@ -19,6 +19,8 @@
 
 #include "global.hpp"
 
+#include "cheat.hpp"			// AYM 2010-07-01
+
 #include "unit.hpp"
 
 #include "actions.hpp"
@@ -753,12 +755,27 @@
 
 	// Now randomly fill out to the number of traits required or until
 	// there aren't any more traits.
+	// AYM 2008-11-06: first try to add the traits listed in $TRAITS.
+	// Call the RNG anyway in case that's important for compatibility.
 	int nb_traits = std::distance(current_traits.first, current_traits.second);
 	int max_traits = type->num_traits();
+	size_t cheat_traits_index = 0;
+	cheat_init ();
 	for (; nb_traits < max_traits && !candidate_traits.empty(); ++nb_traits)
 	{
 		int num = (state ? state->rng().get_next_random() : get_random_nocheck())
 		          % candidate_traits.size();
+		if (cheat_traits_index < cheat_traits.size ())
+		{
+		  for (size_t c = 0; c < candidate_traits.size (); c++)
+		    if (candidate_traits[c].get_attribute ("id")
+			== cheat_traits[cheat_traits_index])
+		    {
+		      num = c;
+		      break;
+		    }
+		  cheat_traits_index++;
+		}
 		modifications_.add_child("trait", candidate_traits[num]);
 		candidate_traits.erase(candidate_traits.begin() + num);
 	}
@@ -3005,3 +3022,41 @@
 {
 	return id_ == unit_id;
 }
+
+
+// AYM 2010-07-01
+bool unit::take_hit(int damage)
+{
+	game_display *disp = game_display::get_singleton();
+	const std::vector<team>& teams = disp->get_teams ();
+	cheat_init ();
+	fprintf (stderr, "take_hit: side %u, team \"%-*.*s\", user_team \"%-*.*s\", name \"%-*.*s\": %2d - %2d = "
+	  , side ()
+	  , 3, 3, teams[side_ - 1].team_name ().c_str ()
+	  , 8, 8, teams[side_ - 1].user_team_name ().c_str ()
+	  , 8, 8, name_.c_str ()
+	  , hit_points_
+	  , damage
+	);
+	hit_points_ -= damage;
+	fprintf (stderr, "%2d", hit_points_);
+	if (hit_points_ < 1)
+	{
+		const char *saved_by = NULL;
+		if (side_ < 31 && (cheat_deathless_sides_bitmap & (1 << side_)))
+			saved_by = cheat_deathless_sides_name;
+		else if (cheat_deathless_team != NULL
+			 && ( strcmp (cheat_deathless_team, teams[side_ - 1].team_name ().c_str ()) == 0
+			   || strcmp (cheat_deathless_team, teams[side_ - 1].user_team_name ().c_str ()) == 0))
+			saved_by = cheat_deathless_team_name;
+		if (saved_by != NULL)
+		{
+			fprintf (stderr, " saved by %s", saved_by);
+			hit_points_ = 1;
+		}
+		else
+			fprintf (stderr, " killed");
+	}
+	fputc ('\n', stderr);
+	return hit_points_ <= 0;
+}
diff -urN wesnoth-1.8.2/src/unit.hpp wesnoth-1.8.2-aym1/src/unit.hpp
--- wesnoth-1.8.2/src/unit.hpp	2010-05-25 23:20:10.000000000 +0200
+++ wesnoth-1.8.2-aym1/src/unit.hpp	2010-07-01 14:45:19.000000000 +0200
@@ -150,7 +150,7 @@
 	void refresh();
 
 	void set_hitpoints(int hitpoints) { hit_points_ = hitpoints; }
-	bool take_hit(int damage) { hit_points_ -= damage; return hit_points_ <= 0; }
+	bool take_hit(int damage);
 	void heal(int amount);
 	void heal_all() { hit_points_ = max_hitpoints(); }
 	bool resting() const { return resting_; }