This could have relevance for pilots wishing to reduce costs of maintain PPL rights (12 months preceeding rating expiry 12 hours flight time of which only 6 has to be PIC).
The whole point of these rules is safety, sitting there as a passenger for a few hours does not maintain flying skills.
You only have to do 1 flight with an examiner once every 24 months (if you cant afford the 12 flights/12months rules that is), so its not very expensive and if you cant pass that then you shouldnt be flying anyway.
To answer the question. No you cant log the time, check LASORS
