I would like to suggest a system where someone in the party may start a vote to kick a player from a dungeon. 1 person just needs to start the vote to kick a party member, and a pop-up will appear in the corner of the screen for the others to vote yes/no to kick the reported party member. Add some limitations, like allowing only 1 kick per party and/or 1 report per player.
There are a lot of times where I join a dungeon and 1 or more players is following the party but standing aside to do nothing, while the rest of the party does all of the work. It’s unfair to the rest of the party that wishes to complete the dungeon quickly and efficiently. I’ve even tried to kindly ask them to contribute to the party, only to be ignored or even mocked.
I know many will say “but it can be abused.” While that may be true, think of how that would be set up: a majority of the party would have to vote for 1 person to be kicked. And while I believe there are people out there that would do that to 1 person just to be funny, they can be reported and dealt with if that ever happens.