I don't know about other Subaru models, but my wifes 2017 Forester does have DRL's that are automatically on when set to auto just like Hyundai....Yeah the BCM module is the major issue. Otherwise it would be a cake walk. Guess I'll just continue to do it manually. SO glad Subaru doesn't do DRL's. I think a WRX is in my future. I used to rewrite the code on that ECU so seems more hacker friendly platform anyway.
I was thinking about this and do the DRL's stay off when parking brake engaged?
I have a Jeep Wrangler.. The DRL's can be enabled/disabled by programming the ECU. Jeep dealers can do it, or you can purchase your own programmer that plugs into the OBD connector that is capable of doing it.My previous vehicle, a Jeep, had a setting that you could modify, on the touch screen.