This goes into gameusersettings.ini

Must use the header [Crunk] above the settings only needed if you dont want default settings

Example:
[Crunk]
SalvageCraftingSpeed=1
SalvageResourceReturnPercent=100
SalvageResourceReturnMax=5000

The above are the default settings. Return Percent will change the percent of materials returned on grinding 100 means u get all crafting resources back. Max is the max of a single item you can get back so if it takes more than 5000 you'll only get 5000 back because its capped. (Used 5000 as that should be high enough you dont hit it often). Speed is the speed of crafting only really effects turning stone to flint or wood to thatch.