Least important and/or liked optional rule

In terms of least important, I can't think of any rule that comes up less frequently that the Death Star Trench Run Sabotage Run on a War Sun rule. I've never seen it work, and honestly I've never even seen it invoked in a situation where it makes sense.

The one rule I like the least is the Leaders, and it mostly just comes down to the fact that I find that my group spends more time looking up and trying to remember what each leader does than they do actually benefiting from the leader.

Thoughts from others?