1. to add a media, you can do it easily with 1 line, without the need to use easyurpmi :

 urpmi.addmedia --distrib --mirrorlist

This command will automatically add all the remote FTP repositories, and will try to select the closest mirror for you. So if you want to only have remote repositories and removed the installation media, you'd better remove all the media/repositories, and then add the new ones :

 urpmi.removemedia -a && urpmi.addmedia --distrib --mirrorlist

2. if you want to do automatic updates, but only install packages from the updates repositories, you can now use --auto-update which will do at the same time a "urpmi.update -a" and a "urpmi --auto-select". So you auto-update script could look like this :

urpmi --auto-update --update  --auto