1. You may publish your family tree at http://familytrees.genopro.com and hide it or password-protect it.  A hidden publication will not be indexed by Google if you hide the publication right away, however if Google index your publication and then you decide to hide it, then Google will still keep it in its index cache.  To make sure a publication is not visible by search engines, the best way is to set a password for it.  The password will deny access to anyone not knowing the publicatio password (including search engines).

2. We are working on a Collaboration Module to have multiple people to simultaneously edit the family trees.  We are weeks away for an update for people to try it.  I am working on the last piece of code to synchronize the transfer of pictures and file attachments.

3. With the collaboration module, you may assing different permissions:

Banned	The user cannot access the document anymore
Read-Only	The user can view the document without access to modify it
Collaborator	The user can modify the document
Moderator	The user can also invite others to join
Administrator	The user can promote other administrators and ban users

Since your publications at http://familytrees.genopro.com are only accessible by you (regardless of the Collaboration Module), you have full control when you want to approve changes and update by publishing again.