ATOM and no password auth, tags, and/or private/public flags

Does anyone know if LJ supports any of the following through their ATOM protocol:

- tags for a post.  It's in the spec, doesn't seem like LJ handles it.
- setting a flag to declare the post private/public/friends only or for a specific group
- authentication that is not through WSSE.  An authentication mechanism that does not require a password.

Thanks.