Make Red Hat Graphical Boot detailed

There is unfortunately no configuration file allowing to switch on/off the details of Red Hat Graphical Boot.
Anyway, for it to be detailed, the /etc/rc.d/init.d/functions can be edited:
- simply add --details=yes into the update_boot_stage function on the line using the /usr/bin/rhgb-client.

It works but each time the initscripts package is updated, it is needed to edit the file ...