Fortunately, from some time both for Joomla 1.0.* and Joomla 1.5.*/1.7.* the above trickery can be made without messing around with code!
How? Simple. The maintainers of http://www.joomlaserviceprovider.com/ have been developed and released for the public a great plugin, jSecure Authentication, wich makes this trick to be simple as click here and then click there too Tongue out.
The problem – as I outlined in the original post – is that now everyone knows how Joomla works, and which are the defaults. Making your site different from these defaults is making it safer. So what you need to do?
First of all go to their site and download the appropriate version. The one for Joomla 1.0.* is a module, the Joomla 1.5.*/1.7.* version is a plugin. Install them, and make the few, obvious installation settings.
Then sit back, grab a lemonade, beer, wine or scotch – at your preference – and enjoy your site’s increased security.