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You can get store value with below code:

$store_id = Mage::app()->getStore()->getStoreId();
$current_cart_total_inc = Mage::getStoreConfig('general/custom_values/free_ship_threshold', $store_id);

You can get store value with below code: to get store id in adminend

$this->getRequest()->getParam('store_id'); 

for frontend

$store_id = Mage::app()->getStore()->getStoreId();
$current_cart_total_inc = Mage::getStoreConfig('general/custom_values/free_ship_threshold', $store_id);

you can get store value with below code

$store_id=Mage::app()->getStore()->getStoreId();
$current_cart_total_inc =Mage::getStoreConfig('general/custom_values/free_ship_threshold',$store_id);

You can get store value with below code:

$store_id = Mage::app()->getStore()->getStoreId();
$current_cart_total_inc = Mage::getStoreConfig('general/custom_values/free_ship_threshold', $store_id);

you can get store value with below code

$order = Mage::getModel('sales/order')->load(23);
$store_id=$order->getStoreId();
$current_cart_total_inc =Mage::getStoreConfig('general/custom_values/free_ship_threshold',$store_id);

you can get store value with below code

$store_id=Mage::app()->getStore()->getStoreId();
$current_cart_total_inc =Mage::getStoreConfig('general/custom_values/free_ship_threshold',$store_id);