"Everything Explained for the Professional Pilot" has a specific section on this topic. Wonderful book by the way. I believe it says something to the effect of if the airplane type certificate only requires one pilot then you cannot legally log it unless you are the "sole manipulator of the controls". Even if the company or insurance wants 2 pilots, the time technically still doesn't count. That's not to say you wouldn't gain any experience from it, it's just not going to help you any in an interview. I don't have the book in front of me, it is down at my crashpad, if you want I'll send you a message in a few days with a scan of the page if you haven't completely answered your question by then.