#include scripts\zm\pause_system;
#include common_scripts\utility;
#include maps\mp\_utility;
#include maps\mp\gametypes_zm\_hud_util;
#include maps\mp\zombies\_zm_utility;

watchchatpause()
{
    level endon("end_game");
    self endon("disconnect");
    
    for(;;)
    {
        level waittill("say", message, player);
        message = toLower(message);

        if (message == "p" && player == self)
        {
            self freezeControls(true);
            self.ignoreme = 1;
            
            zombies = getAiSpeciesArray("axis", "all"); 
            if (isDefined(zombies))
            {
                foreach(zombie in zombies)
                {
                    if (isDefined(zombie) && isAlive(zombie))
                    {
                        // Create an invisible anchor point at the zombie's feet
                        zombie.pauser_anchor = spawn("script_origin", zombie.origin);
                        zombie.pauser_anchor.angles = zombie.angles;
                        
                        // Physically link the zombie to the stationary point
                        zombie linkto(zombie.pauser_anchor);
                        
                        // Disable their attack/AI processing
                        zombie.ignoreall = 1; 
                        if(isDefined(zombie.zombie_move_speed))
                        {
                            zombie.old_speed = zombie.zombie_move_speed;
                            zombie.zombie_move_speed = "stop";
                        }
                    }
                }
            }

            // HUD
            if(isDefined(level.pause_hud)) level.pause_hud destroy();
            level.pause_hud = createServerFontString("default", 2.0);
            level.pause_hud setPoint("CENTER", "CENTER", 0, 0);
            level.pause_hud setText("GAME PAUSED: Type 'u' to resume");

            while(1)
            {
                level waittill("say", m, p);
                if(toLower(m) == "u" && p == self) break;
                wait 0.1;
            }

            // --- Unfreeze ---
            zombies = getAiSpeciesArray("axis", "all");
            foreach(zombie in zombies)
            {
                if (isDefined(zombie) && isAlive(zombie))
                {
                    zombie unlink();
                    if(isDefined(zombie.pauser_anchor))
                        zombie.pauser_anchor delete();
                    
                    zombie.ignoreall = 0;
                    if(isDefined(zombie.old_speed))
                        zombie.zombie_move_speed = zombie.old_speed;
                }
            }

            if(isDefined(level.pause_hud)) level.pause_hud destroy();
            self freezeControls(false);
            self.ignoreme = 0;
        }
        wait 0.1;
    }
}

zm_mod.gsc

#include common_scripts\utility;
#include maps\mp\_utility;
#include maps\mp\gametypes_zm\_hud_util;
#include maps\mp\zombies\_zm_utility;

init()
{
    level thread onPlayerConnect();
}

onPlayerConnect()
{
    for(;;)
    {
        level waittill("connected", player);
        player thread onPlayerSpawned();
    }
}

onPlayerSpawned()
{
    self endon("disconnect");
    for(;;)
    {
        self waittill("spawned_player");
        self thread watchchatpause(); // This starts your script!
    }
}

you must include both into \AppData\Local\Plutonium\storage\t6\raw\scripts\zm
enjoy
all you have to do is type p in chat and it pauses the game and to unpause type u.
source gemini