Mounting inline brake levers as primaries today, I realized they could be mounted to work in either direction. I mounted them like miniature flat-bar levers, but I could easily put them on the forward-pointing portions of the time trial bar on this touring bike, just by feeding the cable through the opposite way. They would act like reverse levers, only they'd leave the end of the bar clear for barcon shifters.
I have to start taking pictures again. I could illustrate these principles. Maybe when I build up my Travelers Check I can set up the different scenarios.