I generally will stand up as I near the crown of the hill so I can check for oncoming traffic for them. If it is clear, I will wave them around. It is up to them if they go or don't but I don't get mad if they don't. I'm just trying to be considerate.My favorite is when you come up on a biker in a no-passing zone on a 2 lane highway. Ride behind them and follow the rule of the road and don’t pass, and they get frustrated and waive you by. Sorry man, this is a no passing zone and I am supposed to treat you like a car, so I’ll just stay camped out back here.
I will also check if there is a car behind me at a stop light when I am in a bike lane that becomes a shared bike lane/right turn lane. If there is I will move to the extreme left of the lane and wave them through. I don't have to, but it doesn't hurt to be considerate. Unfortunately many of them are surprised that a cyclist would go to the trouble to do it. But, hey, I am just sitting here anyway, I've got nothing to do until that light turns green. More people should be considerate and there would be a lot less road rage.