Some of the Da Vinci tandems get pretty complicated. They have an independent coasting feature allowing either rider to stop peddling with drive still maintained. Think Matt would have told me to GTFO if I'd asked for something like it.
My dad and his wife rode a tandem from Malaysia to Hong Kong, in absence of such tech he had a garage in Thailand weld some motorbike footrests on the rear downtube for his wife to put her feet on while he pedalled....
Some of the Da Vinci tandems get pretty complicated. They have an independent coasting feature allowing either rider to stop peddling with drive still maintained. Think Matt would have told me to GTFO if I'd asked for something like it.