I do see your point.
"Unless authorised by the administrator"= ETOPS, which have been developed especially for twin engined, turbine powered aircraft.
If you want to fly a piston twin more than one hour from an airport the answer is usually no except for special authorisations such as ferry flights.
If you want to get authorisation for your three engined Piston or twin wankel aircraft, put together a case showing that the particular airframe/engine/operator combination provides equivelent safety. Difficult because very few of the former and none of the latter exist.