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Field descriptions:
System.SystemIdentSettings are stored permanently but do not show up in logs.  DataObjects.SystemIdentState shows up in logs but is not stored permanently.  Read the xml files or source if you need to know more of the technical aspects of their fields.
  The field descriptions in the xml files should be displayed on the System page if you hover over a field or enable "Show Descriptions" (click the eyeball at the top to find this setting) (not working as of this writing).

Changes to these fields generally take effect after either entering AutoTune mode (even briefly, either armed or disarmed) or rebooting the FC.

System.SystemIdentSettings:
- Is stored permanently
- Is not logged
- Is reset to default values if you stay in AutoTune mode until the shaking starts (about 2.5 seconds).  As with other data changes, this is not stored permanently until you disarm.  If you power off without disarming, the reset values are not stored permanently.
- Tau, GyroReadTimeAverage, Beta (3 values), and Complete are the fields filled in by the AutoTune flight.  Other fields are used by SmoothQuick to convert these values into PIDs and check and limit the PIDs.
- DampMin, DampRate, DampMax affect the control damping.  Decrease damping to make your aircraft response more rapidly.
- NoiseMin, NoiseRate, NoiseMax affect control sensitivity.  Increasing noise (sensitivity) will make your aircraft respond more rapidly, but will cause twitches due to noise
- These Damp and Noise values together form the dual virtual slider SmoothQuick
- The smooth end of SmoothQuick uses DampMax and NoiseMin
- The quick end of SmoothQuick uses DampMin and NoiseMax
- The center of the SmoothQuick slider uses DampRate and NoiseRate
- CalculateYaw can be False,TrueLimitToRatio,TrueIgnoreLimit default is TrueLimitToRatio
- YawToRollPitchPIDRatioMin is enabled with CalculateYaw default is 1.0
- YawToRollPitchPIDRatioMax is enabled with CalculateYaw default is 2.5
- DestinationPidBank default is 3
- TuningDuration is 60 seconds
- DerivativeFactor default is 1.0 and can be set between 0.0 and 1.0 to reduce the normal PID D term (helps reduce D term oscillation if that is a problem)
- SmoothQuickSource default is 25 (FMS toggle method with 5 positions)
- SmoothQuickValue default is 0
- DisableSanityChecks disables certain checks that stop the PIDs from being written default is false
- Complete is set true after a successful AutoTune run.  It must be true for PIDs to be written to DestinationPidBank 

DataObjects.SystemIdentState
- Is not stored permanently (Goes away when power is removed)
- Is logged
- HoverThrottle is the average throttle used during tuning.  It is a reasonable value to use in Settings.AltitudeHoldSettings.ThrustLimits.Neutral although it is usually a little smaller than it should be due to throttle bloom during shaking.
- The 3 values in Noise tell you how much vibration you have on the 3 axes.  Normal values range from about 100 to about 1000.  For high values, or jittery response to the PIDs created, you may want to increase Settings.StabilizationSettings.GyroTau (found in the GCS GUI at Configuration -> Stabilization -> Expert -> GyroNoiseFiltering) and retune.  Now you know how much vibration you actually have.
- Contains fields that may be useful if debugging problems with AutoTune
- Contains copies (for logging purposes) of some fields from System.SystemIdentSettingsPID bank 1 should have default PIDs or something that is at least known to fly without oscillations.