The org.zefer.pd4ml classes in v4 are to support v4 JAR as a drop-in replacement for v3. The classes translate old API calls to the new ones where it is possible.
PD4ML_ABSOLUTE_ADDRESS_SPACE = document behavior tried to simulate pagination logic of HTML printing in older Web browsers. As far as I know, modern browsers does not break pages that way anymore. So we did not try to reimplement the feature in v4 (yet).