Yeah that little mod is hands down the only reason I got the game in the first place.
Because the Alien AI will only 'activate' additional abilities when you trigger them, if you play carefully and don't use tools and lockers, you can find yourself in situations where you are pinned in a room and in all probability the Alien 'should' realise where you are, but can't/won't because you haven't activated it's ability to search a locker yet. So the Bastard keeps patrolling back and forth but won't/can't do a proper search, and the horror factor drops to zero at that point.
But with the mod it isn't unnaturally forced to hang around, it will logically patrol and search based on what abilities it has, and it is very rewarding when you can evade it for great lengths of time, and much more horrifying when mid to late game when it DOES know where you are and when it actually HAS activated those abilities, then it really is on your ass and that is scary AF.
I had a real scare when I evaded the alien for some time, and I was casually walking through a very long hallway and suddenly right at the end of the hallway the door opened on it's own... and there it was. I was completely unprepared.. that damn thing was busy searching the other half of the map the whole time hhahahahahaha.