All file dialog settings are stored in the 'KFileDialog Settings' group.

HelpCommandPath		Path to kdehelp binary
HelpFilePath		Path to kfiledialog help
			(use KConfig i18n features to handle the paths for
			different languages)
FindCommandPath		Path to kfind binary
ShowListLabels		Should the list boxes have labels?
UseTreeView		Tree/Finder view if tree, list view if false
			only the list view is currently implemented
IncludeDirsInContentsList	What it says. (boolean)