[EGreg]

Well, that's why a good framework should be built in a modular and extensible way. For example, the way we build our Q framework (previous open source version is here: http://phponpie.com) is that you can override the core with plugins, and plugins with your apps. There is a cascading file system, that I learned from Kohana. Very useful!

[camus]

symfony is so modular you dont even need to fork it , just write plugins.

[EGreg]

yep, that's what I am talking about