Yeah, this is a rather interesting snippet that has value to me, but does not seem like it would have value to others. Perhaps if a context trigger was based on this code.
The basic idea here is to check if staff role is the only role that has access to this content, if so do something.
$roles =content_access_get_per_node_settings($node);
if (in_array(4,$roles['view']) and !in_array(1,$roles['view']) and !in_array(2,$roles['view'])){return true;}