Yeah, it is a very interesting key combination to hit lol It also feels strange telling people to hit "FU" in posts.

As far as turning in quests you have to click the button, I do not believe there is a key you can press. I used the mouse broadcast in IS and used that to turn in quests all at once if there wasn't a reward to pick. If you have to pick a reward I turned the quest in on at a time.