The scenario you suggest is not the norm. It does happen at the best of airports, however other airports get lateral and vertical separation and then one aircraft gets the other runway. Obviously, we can't do that in Hk because it's written that pax aircraft land on the left and freighters on the right.
Flexibility: key to airpower.... lets not get bogged down by dogma etc etc
Flexible Response
I would have thought that a "US Carrier" going through the centerline would not be a problem as their tower is only a few hundred feet amsl. Besides with all that firepower... who is going to argue...
oops .. different US carrier... I'll get me coat...