Hi All,
I spoke with John at Wadia. We are ALL CORRECT. He said there would be no issue with running one channel. And further suggested to not put a dummy load on the un-used side. However, IF dummy loaded PROPERLY, that would be no issue, but not necessary, so don't risk it. I did not ask what proper dummy loading would be. Also, all four outputs are "buffered" ??? for the same load - I probably am relaying this incorrectly, but that you can actually use all four at once.
Thanks again for everyone's thoughtful ideas and insights,
Jim