In version 4.6.6.1 we have introduced “Realistic Mode” to the Crew Chief. You can enable it in Preferences window.

When realistic mode is enabled, Crew Chief behavior changes in the following ways:
* Spotter
is enabled only in oval races. This is determined by “isOval” flag for each track in trackLandmarksData.json file.
* Crew Chief checks "useHundredths" value for car class defined carClassData.json. If value is true, gaps and laptimes are reported with hundredths precision, otherwise tenths are used.
* Each car class defined in carClassData.json file has list of message types enabled. List of supported message types:

TYRE_TEMPS, TYRE_WEAR, BRAKE_TEMPS, BRAKE_DAMAGE, FUEL, LOCKING_AND_SPINNING, ALL, NONE

The idea behind different message type sets is that different series have different information available to spotters. For example, older vehicles did not have sensors to report brake and tire temperatures back to the pits. In 70's, there was no hardware to measure gaps in hundredths. In Karts, there’s simply no radio communication at all. Lastly, as part of emphasis on the driver skill vs electronics (fly by wire), not all modern series allow telemetry data to be available to the driver during the race. Here are some factoid examples:

See 27.3 - https://www.adac-gt-masters.de/docs/adac-gt-masters/2017/static/89/Reglement_ADAC%20GT%20Masters_2017.pdf
F1 2017 Technical regulations - 8.5.3 Pit to car telemetry is prohibited. - http://www.fia.com/regulation/category/110

We’d like to hear your thoughts and suggestions on Realistic Mode, have fun!