Sharing of flying didn't appear to be an issue worthy of discussion at the conference but there was on the best allocation of resources in instrument approaches (incidentally, the presenter was one of the line pilots present):
Captain Colin Milne, using two recent accidents as case studies, explained how the lack of specific procedures and prescribed use of existing automation, had resulted in the aircraft being placed into a situation where recovery had not been possible. He also brought attention to the fact that, in many of the accidents/incidents experienced in the North Sea, the PIC was PF and the SIC, PM; this was contrary to the practice in the airlines where the more experienced pilot assumed the monitoring role - ready to advise corrections or, in extremis, to take control.
As HC has said, with offshore approaches the PF/PM allocation is usually governed by the side of the platform to which the approach is being flown.
Jim