Item Clicking Thoughts

Entity:
    Left Click:
        EntityPlayer.attackTargetWithCurrentItem:
            ItemStack stack = getCurrentEquippedItem();
            if (stack != null && stack.getItem().onLeftClickEntity(stack, this, entity))
            {
                return;
            }
    Right Click:
        Alredy exists

Blocks:
    Left Click:
        Can Only send 1st and Last click to server...
        Due to how the server calculates the 'clicking' of blocks when mining, we don't get a correct block-hit event.
        So we have the already existing Item.onBlockStartBreak
    Right Click:
        We have onItemUseFirst