Another thread discussing the "persnickety" nature of derailleur and cable adjustment prompts me to post this link;
"The idea has been tried before, but upstart company 5 Red has introduced what is easily the most over the top, yet completely refined, hydraulic shifter and derailleur setup yet offered. Yup, that's right, I said hydraulic, as in no conventional cables or housing. Instead, tiny master cylinders in the shifter actuate slave cylinders in the derailleurs for a fully weatherproof system that won't stretch, corrode, or fray."
The photos appear to show the the system on a mountain bike, and that's probably where they'll get a big enough market to bring the product mainstream. I think the whole different set of variables for MTB's just might share the same potential solution that hydraulics could offer for road tandems.
I like the simplicity of the trigger mechanism with the up/ down levers. I could easily think of two or three ways that this could be incorporated into road style hoods that would be much easier and efficient than either Campy or Shimano methods if they can get around the patents.