Excuse me. Sorry I wasted your time. There are in fact settings in the Service menu that affect both lights and running lights. I don't have the latest firmware, so it is possible there are newer settings as well. Worth a look.
I found this translated from a German website: "According to you can set that the daytime running light is always on (daylight on) and that the headlight is then turned on and off via the switch (dl autonom on)."