Agree with Nev....
Only applies to Low-cap RPT ops - hence the name...
Section 82.3
Conditions on Air Operators' Certificate holders authorising regular public transport operations in other than high capacity aircraft
So - operators requirements notwhithstanding, this means by law to fly a Metro or SAAB or -100 Dash, in command RPT, you must have 500 Multi command.
To fly a 737 in similar circumstances - you do not. Go figure.