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Probably this kind of thing...
http://www.sjscycles.co.uk/shun-alloy-104-pcd-4-arm-freewheeling-cranks-170-mm-silver-prod23859/
Probably this kind of thing...
http://www.sjscycles.co.uk/shun-alloy-104-pcd-4-arm-freewheeling-cranks-170-mm-silver-prod23859/
You can get clutched cranks which provide that facility.
#justsayin
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....