Bob Hawke
I see your point but as an FO that frequently requests jump seats I make it a priority to thank the captain for releasing the jump seat if I should require it. Most of the time I don’t though. My wife usually takes up a box of chocolates as a thank you. It just common courtesy.
As for managers holding multiple jump seats, I recall a certain female ISD manager who has a Hispanic surname holding three J1’s and a J2 over News Years this year out of SFO over three days.