Uk FO, pooleys log book, log mine in the PIC column when PF, co-pilot column when pm, it's obvious you're not claiming the hours as actual command hours as you've got the commanders name in the in command column. Makes adding up hours a lot easier. Never had any problems from the several airlines that have inspected my logbook. It's your logbook, to my mind you can write it in however you want, just so long as you know know what hours are what and can explain how you've logged them to anyone who asks.