Also would it not count towards helping your team? Maybe winning the duel give +20 to your team score in addition to the kill point and extra personal glory. You just won a fight with an opposing player - you helped your team regardless. And I am not talking about something that would happen ALL the time for ALL players. My idea would still be optional (you can choose not to accept) and it would be severely limited (ie you will only see it a couple of times in a round, if at all). The point wasnt to introduce dueling as a past-time pleasure and training exercise, but an integral part of sPvP. An sPvP special event to spruce things up, sort of speak.
Why dont we add races around the playing field, and a special +50 points for most damage. Adding 'special events' in pvp is gimmicky and unwanted. Buffs like in Temple is bad enough. Dueling as a past time pleasure and training? Sorry that I play support and will die every time. Go to an empty server while you wait for custom arenas if you want to duel, it has no place in structured TEAM based PvP.