We'll update the documentation. By default, a new repository will audit successes in the following event classes for the Everyone group: Account, Annotation, Auditing, Entry, Metadata Definitions, Page, Privileged Operations, Records Management Actions (if applicable), Records Management File Plan (if applicable), Session, and Volume.
When you create new users and groups, they will use the audit settings according to group membership by default, meaning it's going to inherit from the Everyone group. You can choose to have the individual trustee use its own audit settings though.
If you modify the events that are being audited for the Everyone group, that will only affect things moving forward. If you change the Audit file location and rollover directory, the files will be moved automatically.