Re: Changing the default error page
The default error page is a sore spot in bbPress. It currently isn’t theme-able. That will change, but not until we get a bit further into 1.0 alpha development.
Private forums are possible via a couple of plugins, take a look at the “Extend” area of this site.
Adding extra profile info is pretty easy via a plugin if they are just simple text fields. You need to add the fields to the profile_info_keys. See get_profile_info_keys() function. Here is some example plugin code…
function my_add_profile_info_keys( $keys )
$keys['ice_cream'] = array( 1, 'Favourite ice cream' );
add_filter( 'get_profile_info_keys', 'my_add_profile_info_keys' );
Adding checkboxes and dropdowns currently isn’t supported via the API.