I also appreciate a driver or pedestrian waving me through, but only if I have the right of way. If not, I signal them to go ahead. There is just too much chance that someone else is not yielding the right of way in that situation. I have had pedestrians in crosswalks, in the process of crossing, stop in the road and wave me on. I will not continue until they are safely across and out of the crosswalk. I stop and dismount, if that is necessary, to show them that I am yielding to them.