I don't seem to understand any of your concerns.
1) The vote disappears once you've voted or if the person was kicked / left the room. There is a message in chat notifying everyone who was kicked.
2) When a kick vote is running against you and you leave the game, you get kicked. This is intended behaviour to avoid dodging kicks as you mentioned.
3) Whether there's a box or a list depends on the size of the room. If there's more players in the room than the list can show, it shows a popup box to make a selection instead. This is also intended behaviour.