i had an idea for a mod not sure if its even possible but hear it goes. (and if something like this exists then please let me know)
Its a mod that adds a new device you can craft, where if you drop this device on the ground in lets say the downtown area it would act sort of like a Settlement work station( except you can't build anything), where it would generate a SMALL area around it that you could then scrap every wrecked car, tire pile, maybe a busted up wall in some alleyway, the counter of some shop, that busted up sentry gun you blew up get some extra steel out of that.
And once your done scraping everything of value you pick up the device again and the area deactivates and you can move the device to another area, say some junk yard perhaps and scrap all the loose piles of cars and get TONS of resources from it. rinse and repeat until you've Scrapped the Commonwealth!.
maybe there would be a positive side effect that since you scraped nearly the entire commonwealth of all the busted up cars and crap lying around, the game wouldn't have to render them anymore, thus giving you some more FPS maybe? :/