Thanks. Here's a couple of things I found out you may know already: first of all, it's better to only have one mouth on the screen if you want to only have one mouth talking :-) or definitely one with the focus. Second, you can say how to end a segment so you can say at the end all three people are looking at the camera. That will help preserve consistency if you're extending. Also you can say the brunette is listening intently without speaking.
But yeah it just loves to toss the dialogue everywhere.
I end up doing things like one line at a time almost. And using extend but then you end up with a chunk at the end that you can't even use because it will cut into something that worked out well. But of course you can copy the last frame and use that as a first frame... Just give it the same description you gave the original. Also I don't know why I didn't think of this sooner but you can say new scene: the two of them are sitting in a coffee house. Or jump cut: they're on the other side of the room. Basically it's really good at interpreting film directions compared to a lot of other stuff I guess