Once this is done, there is no way an additional pilot can log P2 (in an approved SPH-unless under instruction, but then NOT in commercial air transport), or that a helicopter can be flown with one pilot (if approved as MPH).[/QUOTE]
This is not totaly correct. Every operator can define minimum crew requirements for his AOC. Lot's of single pilot helicopters are operated multi-crew offshore. Downside is, the crew needs to be rated MPO.