Technically you cannot log landings, IMC, or approaches as PNF even if you are the PIC. The regs state that you must be the sole manipulator for those. If do want to log it just for kicks, make sure that you don't rely on PNF landings and approaches for general aviation currency...cuz it doesn't count, not even a little but.

Night, XC, Turbine, ME, Total time is all loggable just by virtue of being a required crewmember.