I've done the same thing. Jus tagging along to see if there is a solution.
Oh here! I found an earlier posting on this. I tried it and it worked for me. The earlier version of the file did not work, but this modified one did. Now I have my full site admin menu back. That's about all I'm sure of at the moment. Check out the following post:
http://moodle.org/mod/forum/discuss.php?d=105926&parent=466482