I have missed the place in the control panel where I can alter basic web hosting settings like preventing directory listing in subdirectories, etc. Can someone tell me where I can find an applet that lets me change these settings?
You can do that with your Htaccess file. That's under Goodies (look for Htaccess/WebDAV). I don't remember exactly how to do it, but I think the page you want for help is at http://wiki.dreamhost.com/index.php/KB_/_Account_Control_Panel_/_Goodies_::_Htaccess_/_WebDAV.