Last night I set up my first PHP project using FB4 really cool, even installed the zend framework. Once I get my application working, if I decide to move the zend installation is there many things I need to change in my flex app to get it to work again.
You need not change much.
If you change the Zend location just modify the same in the amf_config.ini file generated under the project output folder on your server.
Uncomment and point the variable 'zend_path' to the new location.