I want to suggest a few things that i would like you to add.

• Add changeable Mining levels for blocks.
• Ability to disable a function of a tool. example: Making a pickaxe unable to mine a block.
• Change harvest levels of tools. This should be a alternative fix if you cannot disable a tools functionality. But still be good to have.
• Ability to disable a modifier from a tool material. example: stone not having stone bound.

Looked into, not possible

this is possible i have changed block mining level and tool mining level in my mod i am working on.

You sure? I have tried this before, and what I saw was that vanilla hardcoded some of their stuff, making it impossible to do it in a minetweaker environment

i used this to changed mining levels of blocks which worked
public static void registerBlockMiningLevel() {
setBlockMiningLevel(Blocks.IRON_ORE, "pickaxe", 2);
setBlockMiningLevel(Blocks.GOLD_ORE, "pickaxe", 2);
setBlockMiningLevel(Blocks.EMERALD_ORE, "pickaxe", 3);
setBlockMiningLevel(Blocks.OBSIDIAN, "pickaxe", 3);
setBlockMiningLevel(Blocks.DIAMOND_ORE, "pickaxe", 4);
}

and i used this to change mining level of pickaxes.

public static void registerBlockMiningLevel() {
	setItemMiningLevel(Items.STONE_PICKAXE, "pickaxe", 1);
	setItemMiningLevel(Items.GOLDEN_PICKAXE, "pickaxe", 1);
	setItemMiningLevel(pickaxeBronze, "pickaxe", 2);
	setItemMiningLevel(Items.IRON_PICKAXE, "pickaxe", 2);
	setItemMiningLevel(Items.DIAMOND_PICKAXE, "pickaxe", 4);
	setItemMiningLevel(pickaxeSteel, "pickaxe", 3);
}

in forge there is a veriable where you can change the mining level of a block or a tool. Ive been using it in my mod. its the same way you would set the mining level of your tool or a block but with the block you want to change in the first peramitor

So you are telling me that this whole method from ItemPickaxe can be made useless with a variable?
http://www.blamejared.com/content/FzWOw.txt

And where is that method?

public static void setBlockMiningLevel(Block block,String toolUsed, int miningLevel) {
block.setHarvestLevel(toolUsed ,miningLevel);
}

public static void setItemMiningLevel(Item item,String toolUsed, int miningLevel) {
	item.setHarvestLevel(toolUsed ,miningLevel);
}

}