I actually forgot scenario #4 and it's a gem.

Standing on my floor having pressed the down button and waiting for the lift to arrive. There is no light behind the buttons but there is display above the lift door which shows that it's on it's way. Some guy walks up and waits along side me. Seems that the arriving lift is direction neutral (can go either up or down depending on which floor button is pressed first). As mentioned in the OP I like to stand back from the door in order to leave space for anyone in the lift who would like to get out. When the door opens this guy (now marching purposefully towards DYKWIA status) darts in and presses the button to the top floor knowing full well that I had been waiting longer then him and that it was me who requested the lift to come to our floor. Absolutely no intention of letting me make my choice first meaning that I had to escort him to his chosen floor before going all the way back down with a few floor stops along the way.