The ability to save/load games added to sandbox settings rather than everything being auto save. I don't mind dying if it's my fault but when it happens because of a bug or an unrealistic interaction, it becomes very frustrating.
I know that you can shoot .223 out of 5.56 rifles safely IRL. This might be implemented to give .223 a rapid fire option in the form of the M16 instead of just being used in the MSR700.
Craft a torch that can be equipped for either combat (with a chance to burn zombies) or for light. Make wall torches. Light cigarettes using torches and campfires. Burn corpse using a torch.