Perhaps some of you may have known this; I just discovered it and thought it would be of value.
I spent quite a bit of time setting facial expressions on an actor that I wanted to reproduce to another in my Library (specifically "Mike"). I found that if you set a "pose dot" on your original and delete that actor: load your new actor and click that "pose dot"; behold, you'll have a exact copy of your first actor.
Cool! is this in the manual somewhere? If so, I couldn't find it. It's a time saver!