We have a Trek T100 a hybrid setup with flat handlebars. Though much of our riding is on paved roads, we do some gravel/dirt tracks while touring, so I think I should keep the flat handlebar for the captain. Plus if I went for drop bars I'd have to change the grip shifters. For higher speeds on road I have added aerobars, and the combination seems so far to be a good one. I've been told that I could run into trouble with aerobars, but at higher speeds the whole rig is very stable.
For the stoker however I could easily change to drop bars or I could add some extentions to allow the stoker to change positions or be more aerodynamic. But as I have never been a stoker I don't know what is comfortable back there. Any sugestions? Stokers care to comment?