Description of problem: The package selection is unintuitive. Some use cases are: You want a really minimalistic system, but without yum. How do you add yum? The way is that you tick a subcategory and untick all packages but yum which is not really nice. Would be nice if there was a search or "deselect all".
In the gui you can currently disselect all. You must use the right click of the mouse to get this behavior. In this case, You can deselect all optional packages and then select the ones you want. I'm closing because I think this functionality is already in the installer.