I presently use SSTP for site to site VPNs between router boards.
It would be fantastic if MikroTik would consider offering the following in the future:
1) Support for TLS 1.2.
2) Granular control of the cipher suites offered on the server.
3) Support for AES-GCM. This is today the recommended secure cipher suite over RC4 for performance reasons. It offers strong performance benefits over AES-CBC.
Seasons regards to all!