- when duelmaxqueued is set to 2, people wonder why they can't join (possible solution: we should just print a large warning in the middle of the screen)
- when there's more than two players permitted, a very good player can play most of the time, while the others have to wait forever (my solution to that: just limit the amount of consecutive rounds to either 2 or the player count (the latter is less fair, though))
- it is often voted by newbies who don't understand the consequences and then have no fun because they have to wait in the queue most of the time (suggestion: just deactivate duel by default on servers, it isn't that great of a mode on regular servers anyway)
What do you think? The community should decide whether to implement any of my suggestions. Input welcome!