The most confusing for me once I saw the Joined Trill trait - was what is the difference between that and efficient.
As far as I can understand it the Trill trait adds it's bonus to the lieutenant TRAINING skills, and it's effects. Which I believe only kicks in once you start putting points into the skill, but that part I couldn't confirm for sure.
The efficient trait adds it's bonus to the commander level EFFICIENCY skills, and it's effects. But I'm really still in the dark as to what those skills actually do, and how they differ from training ones. I didn't get far enough on OB to test them.
I'd therefore add that the skill descriptions could use more clarification too..