When I took my petrol FR for its 1st service I asked if they could programme this feature out,
Dealer service manager said they could not. Service manager said he turned it off every time he started his! I asked if the starter and ring gear had be uprated to cope with this. Answer No!
The cynic in me says that the starter/ring gear will fail just after the warranty runs out.
Another interesting point is that it is recommended that a turbo engine is idled after a hard run to allow the turbo to cool before switching off so that the oil in the turbo feed doesn't carbonise.
So tear down the motorway and then get caught in accident or traffic and the engine switches off no idling to cool the turbo. I understand that there is a case, not Seat, where a manufacturer accused the owner of not carrying out this idling procedure and would not contribute to an early turbo failure on a car with the stop/start feature. Surely this must be conflict in correct operating the car and the stop/start.