Greetings, all!
I'd like to see this option in a future version. It's like Ironman mode from other games. In short, the game saves at specific times in specific slots and you can't just save and reload on demand. (Perhaps have a save and quit option.)
Why?
This helps the game feel more like a tabletop game, where one cannot simply reload after every undesired incident. Yes, there's the possibility to do that manually now, but if I have the option to reload away my mistakes, I'm likely to do so.
Note that this would be independent of difficulty. Thus, Hard Campaign Mode is separate from Easy Campaign Mode.