Were You Raised In A Barn

It seems AI do not close doors, or rarely do. This mod works off the principle below and varies depending on current threat level. Lower threats they will close door. Higher threat they should leave it open.

Door Open > AI passes through then closes door.
Door Closed > Opens door, passes through, closes door.

This means approaching a building with all closed does not mean an AI has not entered it. This also applies to interior door so they could potentially be in a separate room in the house with the door closed.