I just asked around to double check.
CutLeavingThresh = 2.5 // Threshold for leaving track
CutJoiningThresh = 1.0 // Threshold for re-joining track
These are distances outside the cut track corridors when we consider the car off track, and rejoined. It is from the front car centreline where all timing / scoring is done from.
CutPassPenalty = 0.40 // Penalty for each driver we pass (this is an inaccurate indicator)
This is the penalty for passing each car while off-track. 3 cars, add 3*0.4=1.2 penalty score.
CutTimeRatioMax = 0.95 // Start penalizing even if we lose 5% of time
We start considering it a cut if you match the predicted speed to within 5% by default. If you're off track for 1.052s, but the predicted time is 1.0s, then there is no 'penalty' added.
CutTimeRatioPenalty = 0.35 // Penalty for fraction of time savings
If you're off track for 2s, and the predicted time is 3s, which is then increased by 'CutTimeRatioMax' 3/0.95 3.15s, then the fraction saved is 1-2/3.15=0.365
Multiply this by CutTimeRatioPenalty and you get an additional penalty score of 0.12775
CutSecondsSaved = 0.75 // Penalty for each second saved
If you save an estimated 1 second off your lap time, add 0.75 to the penalty score.
CutWorstYawPenalty = 1.5 // Penalty for staying under control
Penalty score from the car being under perceived control, if the yaw angle is 0 then that means you followed the track perfectly, you get 1.5 penalty added, if you spun the car 180° you'd have a -1.5 penalty score added. It follows the cosine of the max yaw angle you achieve thus, a 90 degree spin would give a penalty score of 0. This should be less than CutWarningThresh.
CutDirectionalPenalty = 1.0 // Penalty (actually reward) for being in wrong direction
If you're moving in the wrong direction, it will subtract this from the penalty score.
CutWarningThresh = 1.6 // Threshold for warning (or disallowance of lap)
This should be greater than 'CutWorstYawPenalty', otherwise you will usually receive warnings / penalties even if you have done nothing wrong.
CutStopGoThresh = 3.0 // Threshold for immediate stop/go penalty
This is set high enough to immediately penalize blatant cheating.
To help tune these, in dev mode you can look into a +trace=3, trace.txt file and look for scoring.cpp entries which will list violations from your driving.
They look something like this.
score.cpp 2988: Rejoined track after possible cut: lap diff = 0, time into lap = 38.576565 - 33.455334, cut et = 4.019997
score.cpp 2994: Rejoined track after possible cut penalty=0.11338: time ratio = 0.323939
score.cpp 2997: Rejoined track after possible cut penalty=0.93930: time saved = 1.101234
score.cpp 3002: Rejoined track after possible cut penalty=2.37280: worst yaw = 0.955664
score.cpp 3010: Rejoined track after possible cut penalty=2.34417: direction = -0.028626
From this example, the final entry penalty=2.34417 is the score I was given for that particular cut, enough to warrant a warning, but not enough to exceed the CutStopGoThresh.
Penalty (in the trace.txt file) is the cumulative penalty score after each attribute of the infringement is added. In the above example, the first is time ratio = 0.323939 which was multiplied by 0.35 to give penalty=0.11338
