Hello,
Since the "IviScope_self_test" function exists in the class driver for scopes, it would seem that this is a required function. I would contact the author of the driver to see what they say about this, but I agree with your initial assessment. If you downloaded the one from National Instruments' Instrument Driver network, there should be a link to LeCroy on that page who was the original author.
Scott B.
Applications Engineer
National Instruments