if(player IsTouching(poi.trig)){
			while(player IsTouching(poi.trig)){
				poi.poi_active = true;//Turns point of interest on
				IPrintLnBold("Inside");
				wait(1);
			}
		}else
			poi.poi_active = false;//Turns point of interest off
			IPrintLnBold("Outside!");
			wait(1);

don tuse the else-statement here, the if-statement was allready true so it wont execute the code under the else-statement

So all I did was take out the else statement, but nothing changed in the game. The zombies still always go to the POI even after I leave the trigger.

function poi_test(){
	level flag::wait_till("all_players_connected"); //edit
	poi = struct::get("custom_poi", "targetname");
	poi.trig = GetEnt(poi.target, "targetname");
	poi.trig SetCursorHint("HINT_NOICON");
	poi.trig SetHintString("");
	// attract_dist, num_attractors, added_poi_value, start_turned_on, initial_attract_func, arrival_attract_func, poi_team 
	poi zm_utility::create_zombie_point_of_interest(100000, 99, 25, false);
	// num_attract_dists, attract_dist
	poi thread zm_utility::create_zombie_point_of_interest_attractor_positions(5, 100);
	poi thread zm_utility::wait_for_attractor_positions_complete();
	coolDown = 5; //Change coolDown to whatever time you want
	while(1){
		poi.trig waittill("trigger", player);
		poi.poi_active = true;
		wait(coolDown);
		poi.poi_active = false;
	}
}

doing this will break on co-op

everyone will be safe as long as one person is in the POI

Is it possible to have it so that every player in the game has to hit a trigger?

//Put these three in your main() function at the bottom
	level flag::wait_till("all_players_connected");
	poi = poi_setup();
	poi thread poi_test();

//These are the two functions I'm using
function poi_setup(){
	poi = struct::get("custom_poi", "targetname");
	poi.trig = GetEnt(poi.target, "targetname");
	poi.trig SetCursorHint("HINT_NOICON");
	poi.hint = "Press &&1 to distract zombies"; //Or whatever hint you want
	poi.trig SetHintString(poi.hint);
	//poi.poi_active = false; *Edit - not needed, is set to false by default in create_zombie_point_of_interest(100000, 99, 25, false);<-here
	// attract_dist, num_attractors, added_poi_value, start_turned_on, initial_attract_func, arrival_attract_func, poi_team 
	poi zm_utility::create_zombie_point_of_interest(100000, 99, 25, false);
	// num_attract_dists, attract_dist
	poi thread zm_utility::create_zombie_point_of_interest_attractor_positions(5, 100);
	poi thread zm_utility::wait_for_attractor_positions_complete();
	return poi;
}

function poi_test(){
	while(1){
		self.trig waittill("trigger");
		self.poi_active = true;
		cooldown = 15; //Change to time desired - I'm using 15 for testing
		while(1){
			if(cooldown > 0){
				cooldown--;
				self.trig SetHintString("Cooling down in ["+cooldown+"]..."); //This updates the trig with time left
				wait(1);
			}else
				break;
			}
		self.poi_active = false;
		self.trig SetHintString(self.hint);			
	}	
}

Like I said before it's probably a lot easier just to make the trig a trigger_use, I have it working fine this way. This is the exact script I'm using with only minor changes to take out some of my checks.

//Put these three in your main() function at the bottom
	level flag::wait_till("all_players_connected");
	poi = poi_setup();
	poi thread poi_test();

//These are the two functions I'm using
function poi_setup(){
	poi = struct::get("custom_poi", "targetname");
	poi.trig = GetEnt(poi.target, "targetname");
	poi.trig SetCursorHint("HINT_NOICON");
	poi.hint = "Press &&1 to distract zombies"; //Or whatever hint you want
	poi.trig SetHintString(poi.hint);
	poi.poi_active = false;
	// attract_dist, num_attractors, added_poi_value, start_turned_on, initial_attract_func, arrival_attract_func, poi_team 
	poi zm_utility::create_zombie_point_of_interest(100000, 99, 25, false);
	// num_attract_dists, attract_dist
	poi thread zm_utility::create_zombie_point_of_interest_attractor_positions(5, 100);
	poi thread zm_utility::wait_for_attractor_positions_complete();
	return poi;
}

function poi_test(){
	while(1){
		self.trig waittill("trigger");
		self.poi_active = true;
		cooldown = 15; //Change to time desired - I'm using 15 for testing
		while(1){
			if(cooldown > 0){
				cooldown--;
				self.trig SetHintString("Cooling down in ["+cooldown+"]..."); //This updates the trig with time left
				wait(1);
			}else
				break;
			}
		self.poi_active = false;
		self.trig SetHintString(self.hint);			
	}	
}

Also this is just a proof of concept script that I made, so you should think about a way to limit this so players can't just keep using it over and over again. The cooldown in the script really should be called "poi active time" or something like that, because cooldown makes more sense to be the time after the poi expires, and before it can be triggered again. You can use a simple wait(time) or some other check. Here's a short vid demonstrating how I'm using it with the script I provided you.

(Content removed from quote.)

does the

player.ignoreme 

variable still exist in bo3?
if it does you could just do something like this

function poi_test(){
        level flag::wait_till("all_players_connected"); //edit
	trig = GetEnt("trig_name", "targetname"); //change trig_name to whatever
	trig SetCursorHint("HINT_NOICON");
	trig SetHintString("Zombie exclusion volume");
	while(1){
		players = GetPlayers();
		for(i = 0; i < players.size(); i++)
		{
			players[i].ignoreme = players[i] isTouching(poi.trig);
		}
		wait(.05);
	}
}

this can also be done with a volume instead of a trigger

PS:this is a quick example you want to do other checks before setting the .ignoreme variable such as if the player is in laststand because if you dont its possible they would become a target if they are downed and not in the trigger zone