3. Stuning: Anyone familiar with Exalted or Scion will recognize that term. Basically, the more cool/awesomely you describe what you're about to do, the bigger of a benefit I'll give you. Don't just say, "I'm going to try and intimidate the predator animal attacking the civilians" say "I'm going to ignite my saber, drag the blade along the ground, sparking up gravel and dust as it turns them to plasma heated gas, and screaming like a rancor!" "Hell yeah! That's what I'm talking about! Have a boost die for that!" It encourages more creative descriptions from the players, and in general, makes the game more dramatic, cinematic, and awesome. Which is what Star Wars is all about.
I honestly thought this was already a "rule rule" not a house rule. As a GM, I am regularly asking my players to "Give me an excuse to give you a boost", especially when they're rolling without any Proficiency dice.