Hi ,

I want to change the crafting rate from explosives , lowgradefuel and gunpowder. 
I have modify the "Options" like this , but it dosn't work. 

{
  "Messages": {
    "BlockedItem": "{0} has already been blocked!",
    "BlockSucces": "{0} has been blocked from crafting.",
    "CraftBlockedItem": "{0} is blocked and can not be crafted!",
    "CurrentCraftingRate": "The crafting rate is set to {0}%.",
    "InvalidItem": "{0} is not a valid item. Please use the name of the item as it appears in the item list. Ex: Camp Fire",
    "ModifyCraftingRate": "The crafting rate is now set to {0}%.",
    "ModifyCraftingRateError": "The new crafting rate must be a number. 0 is instant craft, 100 is normal and 200 is double!",
    "ModifyCraftingRateItem": "The crafting rate for {0} is now set to {1}%.",
    "NoBlockedItems": "No items have been blocked.",
    "NoItemRate": "You need to specify an item and a new crafting rate for this command.",
    "NoItemSpecified": "You need to specify an item for this command.",
    "NoPermission": "You don't have permission to use this command.",
    "RemovedItem": "Removed individual crafting rate for {0}",
    "ShowBlockedItems": "The following items are blocked: ",
    "UnblockItem": "{0} is not blocked!",
    "UnblockSucces": "{0} is no longer blocked from crafting."
  },
  "Options": {
    "BlockedItems": [],
    "CompleteCurrentCraftingOnShutdown": false,
    "CraftingExperienceRate": 100.0,
    "CraftingRate": 100.0,
    "IndividualCraftingRates": {
      "gunpowder": 0.0,
      "explosives": 0.0,
      "lowgradefuel": 0.0
    },
    "InstantBulkCraftForAdmins": false,
    "InstantBulkCraftForModerators": false,
    "InstantBulkCraftIfRateIsZeroForPlayers": false,
    "InstantCraftForAdmins": false,
    "InstantCraftForModerators": false
  },
  "Settings": {
    "ChatPrefix": "Crafting Controller",
    "ChatPrefixColor": "#008000ff"
  }
}​

I can't program hope anyone has a solution.

Best regards 
Source

"CraftingRate": 100.0,
"IndividualCraftingRates": {
"Gun Powder": 0.0,
"Explosives": 0.0,
"Low Grade Fuel": 0.0

You have to write the regular item names WITH correct capitalisation.

My code looks like this and it works:

"CraftingRate": 0,
"IndividualCraftingRates": {
"Timed Explosive Charge": 100.0

Hope this helped, even tho you asked a year ago...