There are an increasing number of "Crew" single pilot operations cropping up around the world.
These are mostly EMS / SAR multi-engine helicopters with a crew compliment of a mix of Crewman and Medical / Paramedical Officers.
Each one is depending on each other to undertake certain roles around any task. Being single pilot really makes the CRM [Human Factors] more critical, as the pilot is relying on other "Non" aviator aircrew to fulfill a vital role.
Follow the following link and look at Case # 200102083, particularly the section "Conclusion" towards the bottom of the document.
www.atsb.gov.au/aviation/occurs/index.cfm