I highly doubt this will be added or even seriously considered but I'm gonna throw it out there anyways:

I play solo most of the time, mainly because I don't want to bother anyone who doesn't want to help me farm. That being said when I use the Party Finder to Find groups to farm for mounts, however, other players consistently leave after a run or two. This makes the party have to look for a new player to join. That's why I think we should have the option to make a party have penalties. An option put into the party menu that would dictate how many runs there would be required for no penalty. Penalty would be the same for leaving a duty. Then to disable the penalty early it would be the same as voting to disband in a duty, except it would just remove the penalty for leaving but not disband the party. I think 1-10 for the amount of runs would be ok.

I don't think it would be too difficult to add since the game already tracks when you complete a duty as well as having a party voting system in place.

I think this could make the game better.