The general question just was: Can NW do parallel Cloning from the same media? 
- And to the best of my knowledge: Yes, it can.

But yaron is also right - it depends a lot on the scenario and the drive 
(types) you use. 
For example, if the source media is a tape, it must be unmounted before you 
start multiple stage/clone processes. Most likely, you have to do this for the 
(A)FTD media as well - but who will do that?

BTW - multiplexing the data on tape does not necessarily prevent shoe-shining:
  - First, the client must have a very fast disk system to demultiplex the data 
in real time
  - Second, the recovery needs all save sets' data at the same time. If you 
only recover a single stream, a multiplexed 
     source stream would be contra-productive.

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