// single items
Route::set('library', 'content/library/(<controller>(/<id>(-<slug>)(/<action>)))',
array('id'=>'[0-9]+', 'slug'=>'.[^/]+', 'action' => 'index|edit|download'))
->defaults(array(
            'directory'  => 'content/library',
            'controller' => 'releases',
            'action' => 'index',
));

// browsing / listing
Route::set('library', 'content/library/(<action>)',
array('action' => 'releases|labels'))
->defaults(array(
            'directory'  => 'content/library',
            'controller' => 'browse',
            'action' => 'nothing',
));