Half solution
use the value = “Guest” in the file form-anonymous.php – from the template bbpress add to the field name and some to the field enalil type value = “guest@guest.com”
Well, how would you exclude obligatory these fields and at least exclude the obligatory email field. But I do not know how yet.
create a directory on your theme called ‘bbpress’
ie wp-content/themes/%your-theme-name%/bbpress
where %your-theme-name% is the name of your theme
find
wp-content/plugins/bbpress/templates/default/bbpress/form-anonymous.php
Make a copy of this file, and put in in the directory called bbpress that you created above, so you end up with
wp-content/themes/%your-theme-name%/bbpress/form-anonymous.php
bbPress will now use this template instead of the original
and you can amend this
in that template you will see
<p>
<label for="bbp_anonymous_email"><?php _e( 'Mail (will not be published) (required):', 'bbpress' ); ?></label><br />
<input type="text" id="bbp_anonymous_email" value="<?php bbp_author_email(); ?>" tabindex="<?php bbp_tab_index(); ?>" size="40" name="bbp_anonymous_email" />
</p>
just remove that – I think that should work