The ability to make oil lamps if you don't have the required items (especially copper) to set up actual lights. These lamps could be made using

Aluminum/steel
Rubber (fuel)
Cotton for burning material

Just a small idea because I find myself out of copper a lot

What's your opinion?

Tilley lamps are found all over the place in the game, some are static & others can be broken down for parts. But yeah nice idea, the more crafting of items the better I say.