I finally did something about the mainsheet hanging on the rudderhead. A couple of experiments with knots and duck tape proved promising, so I made a very simple system which so far has kept the mainsheet off the rudder 100% of the time. We like it so much I made a video showing how I did it, http://www.sailingtexas.com/Movies/FlyingScotRudder/flyingscotrudder.html