I\'ve recently begun building version 2 of my year-old custom MVC framework. It\'s worked great for me on a number of projects, but I definitely see room for improvement. It
it is nearly no problem to extend the Zend Framework.
It is an common practice to setup some kind of "myExtenions" wich are co existing with the Zend Framework Library. As example you can take a look on :
Zym Zend Framework Extension