I don't know of a way to do it in bulk. And the likelihood is that you will need to tweak the entry in at least one of the albums in a set anyway as the databases do not always have exactly the same information in the same way for disk in a set.
As for 3. We can't help if we don't know what you are trying to print or display. OCD has a number of print options. Exactly what are you trying to do. The MORE details you provide, the easier it is to help you.