Perhaps most productions and principle photography schedules are long, hard, arduous work and sometimes for little to no pay. On a long production it’s just a matter of time before someone tips over. Consider some of the following to help:
Listen to people; it’s better to have a heated discussion or two than resentment on the set.
Remaining open through listening to ideas. Chances are your sound director has a higher level of expertise within his discipline then you do. So do the production a favor, empower people to get a quality finished product and happier crew.
You can always play the shot both ways (time permitting), yours and their then decide in post which honestly works better. Most people just want to know that they are being listened to and taken in to consideration.
Craft services; really does make a shoot work. A shoot without food and drinks will quickly prove to be inefficient. Keep your people sugared and coffeed up. While it’s nice to think that they should take care of this need on their own, you should really only expect them to show up on set and do their job.
It doesn’t even need to be good coffee, so much bonding has occurred in the history of film over terrible coffee. It just needs to be there, and it needs to be there and ready before anyone shows up.
The same is true for food. Cater for both sweet/junk (plenty of chips, cookies and other comfort foods) and healthy variety, the talent tend to request or rather demand healthy food. (also think fruits, granola, juice and water) Shooting a movie is stressful, and sometimes an apple just isn’t going to cut it.
Finally, get involved and lead by example. Yes you already have a demanding job but it is impressive when a director who is on set early and occasionally gets his hands dirty.