I know it's a lot late, but posting anyways because someone will find this helpful.

There is a mailing list where you can directly contact WSO2 IS developers. To subscribe, visit https://mail.wso2.org/cgi-bin/mailman/listinfo/iam-dev Also, there is a new forum too. https://iam4devs.wso2.com/wso2-identity-server-49

If you are willing to try out Asgardeo,the cloud offering of wso2 IS, and get help along the way, consider joining https://iam4devs.wso2.com/asgardeo-1 as well.