FCombatDistance
From GECK
This setting sets the minimum distance that an actor will approach the player during combat. If the actor happens to get closer for some reason, the actor back away as soon as possible. It should be noted that this is also the distance which melee attackers have to close before being able to do damage.
Examples: Default setting of 128: Melee Attacker damages player when closer than 128.
256: Melee Attacker damages player when closer than 256.
1000: Melee Attacker damages player when closer than 1000