OpenID Connect (http://openid.net/connect/) is the modern variant of SAML, and should be supported for SSO login for aha itself as well as for idea portals. OIDC is simpler to setup than SAML, and it is possible that a wider range of Identity Provider (IDPs) can be used by your customers.
|Release time frame|
Thank you for your idea. As noted, SAML 2.0 is currently supported for SSO. Given this option and other priorities we are unlikely to implement this idea at this time. We will however continue to monitor it for community feedback. We hope you can understand.