Sometimes you need to override default yum settings, such as when making a one-shot full groupinstall regardless of how yum usually treats optional elements While it is technically doable by changing the yum configuration and then changing it back, it's a lot of overhead for a one-shot operations and makes it all effectively impossible to use in web faqs and walkthrough. (anything that requires opening a text editor is usually a dead end) Please add a CLI option to yum that can be used to perform one-shot full groupinstalls yum-3.2.20-3.fc10.noarch
You might want to try: http://projects.robinbowes.com/yum-grouppackagetypes/trac ...feel free to package it, if you want, as we're not desperate to have it in yum-utils (IMO the real fix is some plugin like yum-config-cmd-line ... which allows you to set these weird config. variables on the cmd line, without requiring 666 plugins to do it).
We now have --setopt in upstream, so that can be used to change these corner case config. options from the cmd line.