the issues of a story arc are listed in random order (see Death in the Family). Old version had them displayed in correct reading order.
Yes, cover date sorting would be ok for the moment. But if you take a look at the Knightfall listing you will see that it is *not* listed in cover date ascending order. E.g. the Detective Comics issues there are listed in this order:
Detective Comics 660, 659, 662, 661, 663
Looks very random.
Looks like this was because they were all released on the same day. I can try also ordering it by the issue number and see if that approximates it better (the problem with ordering it by the issue number is that it wont use the special logic that helps it handle things like 0.5 and such... but its only after it orders it by release date)