I played my first 2.0 game last night and noticed that the rule for Lock is a bit different (you can measure to all targets before deciding who you lock, much like attacking) and it got me thinking about the rest of the actions. How specific do I need to be for a barrel roll before it's considered a failed action? Do I need to say left with the position (foward/mid/back) or is left simply good enough (or too much even)? Same with boost.

Never mind, found the answer in the Rules Reference. You declare left/right, then go from there.

I'll supplement: Coordinate and Jam work like the revised Lock action. Both will allow you to measure to any number of friendly or enemy ships, then choose one within range to perform a free action, or assign a Jam token.