Sometimes you open a quest window that you cannot complete, i think DK should click cancel on this to close the window

Ohh, I just came across this. You meant for repeatable quests e.g. Gaining Acceptance and Gaining Even More Acceptance in Thorium Point. I agree now.

The ignoreDisabledButtons option is for this exact thing, actually.

The main distinction would be to ignore popup disabled buttons and not a quest panel with a disabled complete button, but that's a very niche edge case that I don't think would ever be a problem in practice; you already occasionally have to click dialogs that DialogKey doesn't like from time to time.