<VirtualHost *:80>

...

# "disable" the default httpd.conf DirectoryIndex
DirectoryIndex __NOFILE__

# simulate DirectoryIndex index.html index.php index.cfm
RewriteEngine On
RewriteCond %{REQUEST_URI} ^(.*)/$
RewriteCond "%{DOCUMENT_ROOT}%{REQUEST_URI}index.html" -f
RewriteRule "^(.*)$" "$1index.html" [R=301,NE]
RewriteCond %{REQUEST_URI} ^(.*)/$
RewriteCond "%{DOCUMENT_ROOT}%{REQUEST_URI}index.php" -f
RewriteRule "^(.*)$" "$1index.php" [R=301,NE]
RewriteCond %{REQUEST_URI} ^(.*)/$
RewriteCond "%{DOCUMENT_ROOT}%{REQUEST_URI}index.cfm" -f
RewriteRule "^(.*)$" "$1index.cfm" [R=301,NE]

...

</VirtualHost>