Initially, the focus was on each hero when they spoke, but now it's static for everyone. I'm not sure if this is an improvement. There's nothing to fix there.
Added 1 minute ago
Rommy, were there many dialogue scenes where the cameras were fixed?
Added 2 minutes ago
And is there a way to quickly launch dialogue scenes without playing through the map?
In C6M4, in the second video, all the cameras are off, and the characters couldn't be seen. I set it to static, and it seems to be working fine.
Not a huge amount, but there are a decent number of messed-up cameras; you can see them in the list of changes where the cameras were fixed.
I don't think you can launch dialogues directly; as an alternative, you could add the start of the video to the beginning of the desired map for testing.