I did wonder if the Audi solution would simply be to fit softer material. I had a good chat with Klauster at the Ruthin meet about how that worked out on the RS4. It seems the original pad on the RS4 was quite aggressive (no squeal problems though) and wore the discs quickly. The Audi solution was a softer pad compound which given the weight of the car and stopping power required meant the pads then wore out quickly but the life of the disc was extended. It's all choices and engineering tolerances but John will be able to explain that much better than me. My totally unscientific experience suggests that below 1200kg (S2000, R26.R, Turbo 2000, Type R etc) brakes hold up well but once the weight goes up braking becomes an issue and all the 1400kg+ (Evo, STi, RS3) cars I've owned have needed a brake upgrade for any track work - but never just for the road.
The standard RS3 pads and discs are great for the road, I can't imagine you'd ever need an upgrade for just road use, no way you'd get the heat into them that you do on track with repeated big stops. The Pagid RS4 pads are a great alternative when you do need replacement pads because from the right supplier (speak to RS3-KEL) they are cheaper than the Audi Brembo pads.
I'll also be adding the rear brake disc and pad upgrade soon and will let you know how that goes.