I enabled it on my '06 E91.
The following is taken from the option spreadsheet.
https://spreadsheets.google.com/ccc?...CPqY7sEC#gid=0
Auto Headlight Sensitivity adjustment from BC Button KOMBI LICHT_AUT_WERT_1, LICHT_AUT_WERT_2, LICHT_AUT_WERT_3 X X X X X 2011-01-08 {unknown} Set all 3 to aktiv, change the sensitivity of your automatic light sensor in your Dash! Only works if you do NOT have iDrive. If you have CCC iDrive, see the option higher up in the spreadsheet. If you have CIC iDrive, there is not yet a known way to do this.