Settler guard AI and how to deal with it

[dragonslayer2k12]

I remember one incident at finch farm a long time ago in one of my saves it was years ago maybe less than a year after fallout 4 came out, a settlement attack happened and the settlers ran out of the walled settlement I built of course but they all lined up on a dirt cliff somewhere nearby and formed a crouched firing line for a short time. Their crappy pipe pistols were no match for some super mutants that came in from the satellite array nearby but for a short time they just kept down crouched at that dirt cliff and continued firing like they had some kind of sense.

 

I'm sure the AI has changed somehow since then because I have never seen the settlers there do that again over the years since. Now they just go running straight at any hostile trying to pistol whip them with a crappy pipe pistol. I'm searching for mods that change their behavior but can't find any so far. I read somewhere recently that if you build an alarm bell in the settlement it would be activated by any nearby guard npcs and non guard npcs would run towards the alarm and stay out of the fight?

 

Would a guard npc stay at their dam post if I gave them a super duper long range rifle? I usually give the named npcs at finch farm maxed out laser rifles that I confiscate from the forged during that quest to get back their dumb kid from the forged.

 

Ultimately how do I get every guard npc to stay at their dam posts and non guard npcs to stay in the settlement? My only success for this so far has been to use mods that allow me to change the position of enemy spawn markers so I can better position those spawns for my turrets to just turn all attackers into smears on the ground but this doesn't work at a place like finch farm where respawning gunners can trigger the settler aggro. I compensated there by building two missile turrets on top of a vanilla wood/concrete block on top of that broken freeway above the settlement. When that one gunner with the missile launcher respawns and takes shots at the brahmins down below he gets hammered by those two turrets near instantly and if he dies fast enough the other gunners don't investigate it. By the time that happens though, most of the settlers from finch farm are almost to the brahmins and they take forever to walk back into the settlement.

 

I suppose I could use some kind of gate that can be locked during an attack lets say that garage door can be unpowered somehow if the alarm bell is triggered? I was also thinking of some kind of enclave mod that adds settlement parts like force field wall and just use it in front of whatever gate I use and have it power on during an attack somehow so they can't get out.