Version 1.7.6 is posted now in the downloads section. This should address your initial issue with a complete network outage when mangament and replication share the same interface. Updated documentation is also available which describes new functioanlity that "suspends" HA on a slave that cannot reach the master and an outside IP.
Work on version 2.0 has begun. A hearbeat link is being considered for 2 node pools. In this case, HA logic would use management IP, heauristic IP and hearbeat to determine a failure and what action to take.