IMO, Instrument time is defined by whether you are flying "solely with reference to insturments," not by whether you or Otto is flying.
Assuming I am indeed in IMC, and using 30 years of past practice, I log instrument time for all time when I am in the seat and designated Pilot Flying (PF), whether hand-flying or on autopilot. I do NOT log instrument time when I am the Pilot Not Flying or when I am resting in the back (when a Relief Pilot is in the seat).
Others may argue that the PIC may log instrument time for the entire time he is in the seat, whether or not he is the PF. I don't have any big quibble with that, but I also don't know what the various regulatory agencies say about it...