API Extensions (The New Plugin/Hook System) Question

[vbresults]

How can we intercept the methods we're extending, instead of having our extension methods invoke after the parent methods?

I.e.

PHP Code:

class Myplugin_Api_User extends vB_Api_Extensions {
    function save(...) {
        // This executes after vB_Api_User::save does, meaning we can't change the output of the parent function directly...
        echo 'Foo';
    }
} 


Also how do I extend classes outside the vB Extensions Api folder, like controllers?