Hello,

For information, the first message post on the forum by a new user needs to be approved before to be published

About your question, no integration yet of third-party avatar.
I don't know when i will work on this, but the first one may be Community Builder (as the most requests for this extension).

For Name, you have an option in Global Options to use username OR full name for logged in users. (General Settings)

Best regards,
Cyril