Hello Daniel,
As I already mentioned, SAP Supports single sign-on for SAP GUI for Window via SNC and we have no plan to change this. You can use the SAP security product SAP Single Sign-On or a 3rd party security product. As stated clearly in the SAP Notes, mentioned by you, SAP is not responsible for the non-SAP security products used for the SNC.
Regards,
Donka Dimitrova