Excerpt from CAO 40.1.0
Logging of flight time
10.5 The holder of a commercial pilot (aeroplane) licence may log as time in command the total time elapsed during his or her command, in flight, of an aeroplane. He or she may log as co-pilot the total time during which he or she serves as co-pilot.
10.6 The holder of a multi-crew (aeroplane) pilot licence must log his or her flight time as follows:
(a) any flight time during which the holder acts as co-pilot while the aeroplane is engaged in:
(i) any operation under an AOC that authorises charter operations or regular public transport operations; or
(ii) a private operation;
must be entered in the holder’s log book as time as co-pilot;
10.7 The holder of an air transport pilot (aeroplane) licence must log his or her flight time in accordance with whichever of the following is applicable:
(c) any flight time during which the licence holder acts as co-pilot must be entered in his or her log book as time as co-pilot.
I don't believe sitting in the RHS during single pilot ops allows one to log co-pilot time.