We all know Fear checks are pretty good things for hitting your players with. Blow that check, and you've got some nasty penalties coming your way, for the entire encounter, possibly some automatic Conflict. I realize they were originally written for Edge of the Empire, which is why it's focused on Fear, but why not turn it around and use it for things like Anger or Hatred?
An example, which I'll hopefully be pulling on my players soon: They're in Act I of Chronicles of the Gatekeeper, and have been working the Robin Hood angle on Reeve Marcolf. They've stolen a lot of his supplies to redistribute them to the people, and even turned some of his guards to their cause. We wrapped up last session with them sneaking back into town to try to depose him. I could just have a battle, but I'd like to throw in a twist.
When they arrive, they'll find the Reeve giving a speech to a bunch of the townsfolk, with a bunch of their fellows awaiting execution. These guys aren't even part of their Merry Men, they're just innocents who have accepted help from the resistance. Most likely, they'll have to watch at least one of these innocent people get his head chopped off, at which point I'll call for an Anger check. Mechanically, it's identical to a Fear check, and if they fail, they'll take a penalty for the encounter, as they struggle to keep their emotions in check.
Or... they can always Give In to their Anger, and avoid most of the penalties I throw their way. "Oh, you failed with Threat? That's a Setback Die and several Strain, as you feel a dark rage welling up inside you. Though I suppose you could just let it out. Three Conflict for Failing a Hard check, and another for each point of Strain you prevent? It's your call, of course..."