No, since European legislation requires the implementation of strong authentication and since 3D Secure is the common standard, it will not be possible to disable this security standard. Please note that 3D Secure gives you an additional layer of security if your card is lost or stolen. However, it will be possible to disable the e-commerce feature for one or more of your cards via the payment settings in S-Net or S-Net Mobile (by disabling the "Online payments" option).