KThemeManager offers easy installation and deinstallation of theme packages. Up to now it was necessary to edit Kde's config files by hand and place the theme's files into various directories. The theme manager automates this task and also keeps book about what is installed. So it can easily remove the installed theme later.
The theme manager separates the themes from the current look of the Kde config files, which tend to change over time. If you are maintaining a part of Kde's config programs, please inform me when you change the format of the config files.