Deggers,
On A320, fuel dumping is not an option, it's plainly NOT available (unless you can pay A LOT of money to get a customized one
)
Locked Door, could you elaborate how the A320 is still flyable after a triple hydraulic loss? I haven't found anything in my books...
The A320 needs always at least one source of hydraulics to control the (remaining) flight surfaces. Lose all of them and your remaining flight time will be rather short.
The equivalent of a manual reversion on the A320 series is simply not called a manual reversion because there is nothing manual about it. It only means the flight computers are not able to compute and actuate surface movements with the degraded systems. Rudder will steer with pedals via cables to the tail (need at least one hydraulic system), and the pitch trim is called "manual pitch trim/only" as opposed to autotrim normally provided. The pilot moves the trim wheel, which turns a bicycle chain and actuates valves in the hydraulic block in the tail...so you still need the hydraulics.
Without the autotrim, the FBW is uncomfortable to hand-fly due to the neutral on the joystick not matching balanced elevator, so for example to fly straight and level in this case will require a constant push/pull pressure on the stick, making it sensitive to departure from steady conditions.