I may have misunderstood this, but it appears to be enabled for all worlds, at least for me.
backRepulsionPercent: 0.8
enabledForAllWorlds: true
enabledForEvents: true
enabledForJapan: false
enabledForRaces: false
enabledForWatopia: false
handCycleExtraHardness: 0.5
manualSteeringExtraHardness: 0.0
maxAvoidanceDistanceInCm: 600.0
maxDistanceForFavoringCorrectSideInCm: 5.0
minAvoidanceDistanceInCm: 200.0
pillDistanceScale: 0.45
pillHardness: 0.45