Add variable in bl-kernel/boot/init.php that allows User to rename bl-kernel/admin folder.
User can then define variable in bl-kernel/boot/init.php and change the foldername itself to effect the rename.
99.security.php
Line 31 - Replace Admin string with folder variable:
Redirect::page('admin', 'login');
Replace with Redirect::page($adminfolder, 'login');