How do you feel about motorists crossing double yellow lines to pass you when you are going considerably below the speed limit? For reference, every state vehicle code that I know of (feel free to correct me if I've missed any) makes it illegal to pass another vehicle by crossing a double yellow line. You are only allowed to cross double yellows to pass obstructions/hazards that make it impossible to continue on the roadway without crossing the double yellow.
I'll add that where I live, almost everyone will pass me on a double yellow without much thought, including cops and myself when I drive and encounter cyclists. Most are reasonable and will pass when there are adequate sightlines and clear road; others not so much. I prefer to be passed even with a double yellow as otherwise I am obligated to pull over and let traffic go by. As I'm often on roads with no shoulder and at best a driveway on occassion, pulling over can be inconvenient whereas it's often very easy for me to be passed even though it's marked as a no passing zone (it's miuch easier to pass a vehicle going 20-30mph under the speed limit than only 5 mph under).
My vote is for the second option. I ride in a centered position and will issue a stop signal to those who try to pass when it's clearly unsafe. If someone seems hesistant to pass and I know that there are no easy passing areas up ahead, I will encourage them to do so by waving them around me even though I know's it technically illegal.