IMHO, many of the comments above show a lack of understanding of exactly what the differences are between
a) Being in command and/or being responsible; and
b) Operating the aircraft.
Does this desire to distrust the abilities of the person on the right and do it oneself come from the basic training given at initial stages - "you are the pilot - if you don't do it then it won't be done". The whole basic traning and initial IR place emphasis on the "pilot" dealing with any emergency or unusual situation and having achieved "primacy" with this SOP, a brief MCC course tries to get people away from that method of operation.
To me, provided that the RHS 200 hour person flying the aircraft is dealing with it as required, I will not step in. Yes I am incharge and absolutely responsible but it's not like I am sitting down the back row....I am closely monitoring and a 2ft or less movement of my limbs combined with two short words puts me flying the aircraft.
Perhaps the new ICAO proposals for a co-pilot licence has it's merits.
Regards,
DFC