Dian and I love the WYMS tandem. 2 riders turning different wheels is NO problem.
One of my students built the perfect CRUZBIKE conversion tandem. He built a cruzbike front end on a standard mountain bike. The stoker sat on a seat on the handlebars and turned the front wheel jast as a Cruzbike. The captain rode in the standard position turning the rear wheel. It worked great with few control problems.
Having a beautiful woman on the handlebars is not a bad way to ride.
I have photos on my book. I can forward to anyone who wants to build it.
Bill Patterson
Prof emeritus
CalPoly San Luis Obispo California