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Yes in customer_admin_edit.php look for:

            'name' => array(
                'title' => _l('Name'),
                'field' => array(
                    'type' => 'text',
                    'name' => 'customer_name',
                    'value' => $customer['customer_name'],
                ),
            ),

change it to:

'id' => array(
                'title' => _l('Customer ID'),
                'field' => (int)$customer['customer_id']? $customer['customer_id'] : 'New',
            ),
            'name' => array(
                'title' => _l('Name'),
                'field' => array(
                    'type' => 'text',
                    'name' => 'customer_name',
                    'value' => $customer['customer_name'],
                ),
            ),
dtbakerReply To: Customer ID