Agreed. Airbus' outright ban on setting MDA is a bit silly IMHO. To my mind, it makes sense to set it in the case of a circling approach, as done on the Boeings. That said, the MDA could only be set to the nearest 100 ft (unlike the 777!), so you would have to level off above the MDA unless the MDA happens to be X00 ft, as RAT5 mentioned above.