Regarding the issue of seat changes on board, i have had crew allow passengers to return to their original seats on board, after they have been changed for W/B purposes, because they are card holders!
I had one argue with me that we shouldnt move card holders in future. i told them thats fine, but they can just sit on the ramp all day and the card holders can enjoy the "special" seat until they realise they arent going anywhere because of them.