Specifically, I may want to add a few seconds into a pause for a character, or I may want to reduce a pause. This could be for comic timing, or it could be wanting to slip and slide one character to fit their actions and audio with another character in the scene.
I see how how move the timelines earlier or later, but not how to add time in the middle of a sequence.
This is necessary for getting the best timing of multiple characters. Is there a way to do it?
The best way would probably be Edit > Split to split your previous take recording(s) and drag the second halves over to the right more to make room for the pause. Then record a short take to fill in the gap and use the blend handles to make it feel like one seamless performance.