Why can't they just set up dueling as a system from inside a party that the leader sets up a game mode and teams with?

You don't get any extra invite spam, you can have multiple modes, and if the party leader was gonna troll you with it, he'd have sent you into the wrong dungeon anyways so you don't actually get any extra abuse.

Use this style to set up 1v1 or 4v4 sets. Have it be elimination, or kill the vip style modes of duels. Anything else could just be understood decisions by the party (classes not to use, ect). This permits full use of sparring without the slight abuse people are so frightened of.

And you guys all need to chill out, I think most are here just to have a verbal fight. It should be about HOW to go about adding MORE not whether or not more is a good idea. Compromise people, there is ALWAYS a way to make both sides happy.