Able to set cck fields hidden/private.

I wrote a module, which hides some CCK fields for certain USER_ROLES. (It can be set on a content type setting page)

Basically, in nodeapi 'load', it unsets the field: unset($node->$fieldname);

BUT when content_view renders the body and the teaser, it renders the unset field's label, even when the field is not in $node

My patch, skips rendering fields when it is not in $node.
By basically adding an if condition:
if (isset($node->$field['field_name'])) {}{

Do you like this solution? Or how do you think to solve, that some cck field should be set hidden/private.