RE: Anyone using Polk Tracker III for FH Sailplanes?
Page 23 of the Tracker III manual is titled "For the Glider Pilot". Mix instructions include Butterfly, Crow, V-Tail with flaps, and something called flaps on throttle stick, with elevator mix for landing. Looks pretty simple to me.
I don't do sailplanes, but I use one Tracker for big warbirds, little ½A planes, sport, aerobatic, whatever, and it sets up quickly. Lots of different plane memory slots.
Good luck,
Dave Olson