Problems with the new Form Validation library

[eluser]Bramme[/eluser]
Okay, I'm running into some problems with the new Form validation library. I'm not sure if it's bugs or if I'm doing smth wrong, so I'd like to post here first.

First up: using a config file to set rules. I changed a field name from "name" to "username", suddenly validation says the field isn't set. When I move the config array to my controller and use set_rules() everything is fine.

A second problem I have is with custom callbacks: I made a callback "unique_username" though I don't like the idea of placing it in my controller so I extend the form_validation library with MY_form_validation.php, however nothing worked. I eventually found out you have to use MY_Form_validation.php. I dunno if this is a bug or not, but I really think CI should be a little bit less harsh on upper/lower case naming conventions.