Indeed, but manpower is often limited in these sort of productions. At least having an “actors’ director” calling the shots can help.
Exactly. Yeah. There are ways to do this, even on amateur productions.
I'm a big fan of running the day's pages with the actors at the start of the shooting day,
before we hit the set, because then I can "pre-direct" them by hearing their first take on the performances, give them any notes I have, and then they can digest that while they prep scenes for the rest of the day rather than me doing "running" direction on each scene as we go. Yes, it takes time at the start of the day, but you more than make up for it when the cameras are rolling because you tend to need fewer takes
and you usually get better results. I really wanted this to be done on
Polaris but I wasn't directing that.
One way to work with inexperienced actors is for the director to walk through the scene with them and give them the subtext of what's going on, i.e. "your character is saying X but she's actually thinking Y," and to tell the actors what the scene is actually about in the bigger narrative, i.e., "this scene is about where the acting captain's is starting to lose her nerve but putting a brave face on," or what have you.
As an actor friend of mine related to me from his training, people tend to hide their true emotions, so a sad person will put on a brave face, or an angry person will bite their lip and try to play pleasant, so it's often a good idea for beginning actors to consider playing an opposite emotion and let the actual emotion peek through the cracks because it will often bring the dialog to life more than if they just played the obvious.
I also advise strongly against having actors try to do accents. My experience with less experienced actors is that they're generally not capable of juggling two balls at once, and the effort to do the accent ends up further limiting their emotional performance and tends to make their characters sound mush-mouthed.