A function included in the GECK version 18.104.22.168.
This is one of 4 functions which can be used to increase the game's performance in situations where many actors are in combat or otherwise doing complex pathing. Note that the flag is cleared every frame, so this function needs to be called in a script running on a reference in the loaded area.
When the SetNoAvoidance flag is set, actors do not perform avoid box movement. Actors do not open doors or angle away from each other.