dynamic prefix !

hello,
i have one prefix , this is 'admin',
i want to have dynamic prefix,
for this read prefix from config file and set it in $prefix
i use this codes in routes.php

Router::connect("/{$prefix}/:plugin/:controller", array('action' => 'index', 'prefix' => 'admin', 'admin' => true));  Router::connect("/{$prefix}/:plugin/:controller/:action/*", array('prefix' => 'admin', 'admin' => true));  Router::connect("/{$prefix}/:controller", array('action' => 'index', 'prefix' => 'admin', 'admin' => true));  Router::connect("/{$prefix}/:controller/:action/*", array('prefix' => 'admin' , 'admin' => true));

but for example, when using usermgmt plugin  , cakephp send error the UsermgmtController not found !
the Router class cann't parse :plugin. :)
Can help me ?

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