I vote there should be a specific area or arena for duelling in each city, so lag won't be as bad when you need to grab the undaunted pledge, bank, or shopping at guild traders.
All skills should be disabled within cities. Way too much fps drop, especially when you port to Rawl'sha and there are maniacs duelling or spamming pointless skill.
Something I had not thought of, but now that it is mentioned I completely agree with this idea. Never understood the need to stand around in cities and spam colorful spells at the ground anyway or throw heals at people who are at full health. There is plenty to do in this game.