For a bit more info the BTV function in the A380 has runway usage timings on the display when you select what runway exit the aircraft will slow for. For example at Heathrow using N6 or N7 on 27L only has an extra 10 seconds or so (if I recall correctly) on the landing roll as the aircraft does not use the brakes until needed to slow for the turn.
However the difference in brake temps between the two exits was quite interesting and the turnaround times much shorter when using the "longer" landing roll out.