Here's a little hint about using spacebar:
If you hit it, or do not hit it, it hardly matters. Why? Because there's an automated delay already built into the game for the server to the client dealing with cutscenes. This delay can't be avoided, and takes almost as much time as playing the entire cutscene in some cases.
Some of us have tested this, for instance, on BT when you ride the shuttle over. You can pound the spacebar but it forces you to wait for the exact same amount of time as it takes to watch the cutscene.
This may be true about the shuttle ride. This is not true of convos. Go storm through black talon by space barring and time it then watch every cut scene and time it. There will be a huge difference.