Basically killing entities drops scrap. The more dangerous and difficult the enemy is, the more valuable it is. But also depending on what you kill it with. Shovel or shotgun. Where as killing it with a shotgun lowers the value a bit and shovel makes it higher
#a mod called "fortune favors the bold".
analog drift
jolly coral
there are tons of mods that already do this. (not the shotgun value thing) but yeh