Just got an A5 and was wondering if anything was worth doing. I've no idea what can and can't be done. However I've heard you can turn the brightness up on the drl's. Allow any led's to work. It would be cool if anyone knows what can be done, and then can actually do it for me.
I think they are at 100% when it's just the DRLs. I think they dim down when the headlights are on. I think you can change the brightness when headlights are on.
https://www.a5oc.com/forums/audi-a5-s5-tech/28600-complete-vcds-vagcom-mod.html#/topics/28600 Should give you a good idea of what can be done/coded. No idea why but that link is for half way through the thread. Scroll to the top and click "Load Previous"