Well, through shiftin experiments I have found that both pins 0 and 1 are useless for a clock or latch pin, but that pin 0 works very well as a data pin IF disconnected during upload as mentioned above. Pins 2 and 3 seem to be able to run the clock and latch pins just fine.
Pin 1 is just plain useless. It doesn't care if you set it to input or output, or try to digitalWrite to it or anything... it just does whatever it wants to do. Would be nice to be able to put it to work. "Get a job Pin 1!" lol