Yeal, That is what I do is cut away, or if I want the scene to contenue, but with another seaker,  to keep the flowing, I save that last frame. Copy all the charactures from the last frame. delete the inbetweens. and paste that last frame in frame 1. but before I add the audio. I Memory dot the new persons voice that will be speaking, so when I add the audio, the head will go back to it's original pose before the audio moves the head. along with adjusting a few of the first frames to make sure the head don't jump on the second frame unnaturally.

Stimes I do make Mimic without the head movement when I know that there is too much that can't be accounted for in a sceens. I wonce experimented with audio for two people talking. As you said, it will work, but I find it much easier to copy and paste the last frame to the first, and very important. Hair and camera. even lights if needed. That sounds like to much work, but when you do that a lot, it becomes second nature.

I now understand what you were saying how Poser adding the audio to the frame you want to start the audio a. I didn't know Poser would do that. I aways heard it started in Frame 1. That is great news along with spawning a morp target for dynamic clothes. 

I can't wait to try all those answers.  Hair and the cloths were my biggest complaint I had about my movies. The biggest problem with dynamic hair. It just isn't as pretty and the conforming hair people have. I find making hair in Cinema very fast and easy, But I never tried to import it to Poser. Next movie I hope will all be done in Cinema, Poser, and Vue Xtream.