Version: 4.3 (using KDE 4.3.0) Installed from: Ubuntu Packages System settings > Keyboard & Mouse > Mouse If I choose the single lick to open/acativate, there are two options: - change mouse icon over symbols - automatically selection (I don't know the exact words, I have a german translation.) Both options have no effect on my system...
I do not think that System Settings needs to do anything special to implement this, and it is likely a bug in KCategorizedView.
*** Bug 182040 has been marked as a duplicate of this bug. ***
Still valid for KDE 4.5 and it‘s really stupid if you hate that spastic double click thingie and use single-click and then it doesn‘t let you easily select files.
The only application I found that respects the automatic selection of files (although here it is really annoying) is KDE‘s kick off menu editor. When you hover over an application/folder it gets selected after the set period of time. Still not fixed in Dolphin, though.
*** Bug 298174 has been marked as a duplicate of this bug. ***