Adjusting twist of sails
SUGGESTED BY (John Frings): It would be nice if it was possible to move the traveller on the mainsheet, and also those of the Genua where it applies, in order to adjust the twist of the sails (and of course, gain or lose performance based on wind speed and direction)
Comment by: Ken Sedgwick
And also downhaul, backstay (mast bend), boom vang, and outhaul!