About ext_driving_hours_per_week. It's from here:
Regarding the asterisks (*) displayed next to Full day drive time. If we have exceeded the daily driving time, then each subsequent hour of excess is marked with an asterisk. For example, we have 9 hours of daily driving, and we drove more - that's it, it was counted for the 10th hour (one asterisk appeared). We drove another extra hour, on the same day or another within a week - again an asterisk. This is purely for information for the driver, there are no warnings or checks. The number of these asterisks is saved in the config exactly in the ext_driving_hours_per_week parameter.