Not that I know of.

A lot of tourers like indexed bar-end shifters. That has the added advantages of fewer cables in between the bars (i.e. easier to put a handlebar bag there), less clutter on the bars, and simpler brake / shifter repairs.

FWIW I've done pretty well with flat bars, bar ends, grip shifter and Ergon grips. I use drops on my road bike, but am planning to stick with flat bars on the touring bike for awhile.