Most values are configurable via weapon slaves. Mode, however, is only configurable via weapon slaves, and so standard Missile cannot be configured to function as lockon or heat seeker, and ChasingTurnSpeedWithTargetInFront and ChasingTurnSpeedWithTargetInBack are not configurable with weapon slaves.
A large volume of values that should be editable in both locations can't. This limits server configurability and per-server balancing options.