Yup, i know that it is possible to define just some settings in php.ini, thanks. But i need some more control on sessions mechanism, for example - to have ability to prolong session without SID change, that's why i need Memcached cache adapter and Memcached session adapter. Moreover, memcache extension is quite outdated, i can't understand why frameworks usually implements memcache instead of memcached.
P.S. @Phalcon - thx very much for examples in incubator, they are very useful.