TYPO3 Core

Hooking functions created with
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/tslib/class.tslib_menu.php']['filterMenuPages'][]
(defined in TYPO3\CMS\Frontend\ContentObject\Menu\AbstractMenuContentObject)

never have access to the capsulated configuration as there isn't any function to expose the values.
For a bit more complicated challenges this hook is therefore useless.

The ugly but possible alternative is an XCLASS.

EDIT:
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More detailed, using the hook the following interface is mandatory:

/**
 * interface for classes which hook into AbstractMenuContentObject
 */
interface AbstractMenuFilterPagesHookInterface
{
    /**
     * Checks if a page is OK to include in the final menu item array.
     *
     * @param array $data Array of menu items
     * @param array $banUidArray Array of page uids which are to be excluded
     * @param bool $spacer If set, then the page is a spacer.
     * @param \TYPO3\CMS\Frontend\ContentObject\Menu\AbstractMenuContentObject $obj The menu object
     * @return bool Returns TRUE if the page can be safely included.
     */
    public function processFilter(array &$data, array $banUidArray, $spacer, AbstractMenuContentObject $obj);
}

All the parameters of processFilter() are filled with values, but most of them can't be accessed because the are protected and never have getter-methods.