CraftTweaker allows you to add or remove dispenser behaviors.

Use IItemDefinition#removeDispenserBehavior method to remove dispenser behavior of the specific item.

ZenScript
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// Dispenser can no longer shoot arrows
<minecraft:arrow>.definition.removeDispenserBehavior();

Use the IItemDefinition#addDispenserBehavior method to add dispenser behavior for the specific item.

itemDef.addDispenserBehavior(IDispenserBehavior behavior, @Optional IDispenserSoundFunction soundFunction)

The IDispenserBehavior function defines how a Dispenser dispenses the item. It has two parameters:

• source: An IBlockSource containing some information of the dispenser.
• item: The IItemStack to be dispensed.

The function must return an IItemStack as the remaining item after dispensed.

The IDispenserSoundFunction defines what sound the dispenser should play. It has an IBlockSource parameter. The function must return a DispenserSound.

ZenScript
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import crafttweaker.dispenser.DispenserSound;

<minecraft:clay_ball>.definition.addDispenserBehavior(function(source, item) {
    print("balance.");
    item.mutable().shrink(1);
    return item;
}, function(source) {
    return DispenserSound.launch();
});

ZenScript
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// itemDef.addShootingProjectileDispenserBehavior(IEntityDefinition projectile, @Optional float inaccuracy, @Optional float velocity);

<minecraft:apple>.definition.addShootingProjectileDispenserBehavior(<entity:minecraft:egg>);

// NOTE: the default value of inaccuracy is 6.0 and velocity is 1.1