If you want you can "move away" the login/password in the address bar but issuing
an other redirection, that is :
in the index.phtml / index.php file
in the protected directory you refresh
quickly (< 1 s) the page (without the need
for the login/password since you are already authentifcated) with index2.phtml for instance
I have already done that, and it was nice
(sometime it was so quick, you can't even
detect it) I don't remember the syntax right now, but there's a way to redirect immedialty, without any delay