Add new filter

@jsmo: I know this response is coming late, but if you (or anyone that comes across this) still needs the solution, the following can be added to your active theme’s functions.php (or even better, a site-specific plugin).

/**
 * Require that a user have 'mbactive' capability in order to be
 * trusted enough not to be moderated.
 *
 * @param $args $caps Array of trusted capabilities. If blank, then any user registered on the site is trusted.
 * @return array
 */
function dont_moderate_mbactive( $caps ) {
	$caps[] = 'mbactive';
	return $caps;
}
add_filter( 'c2c_never_moderate_registered_users_caps', 'dont_moderate_mbactive' );