It adds no value over the current setup. IIRC it was there to enable
completion by default but it's already enabled by default nowadays.
Also fixes the permission on /root as reported in
https://bugs.kali.org/view.php?id=5922
* Add new --variant option to build alternative images of Kali.
* Add new --version option to decide of the name of the generated file.
* Add new --subdir option to indicate where the image must be moved.