Disable the "quick view" feature: I like the Previewer plasmoid, but I think after a few months of trying to use it there is no need for having a separate menu entry (shortcut: CTRL+Return) in Dolphin: Doing a drag & drop operation to the previewer plasmoid is faster than selecting a file and pressing CTRL+Return (or selecting the menu entry). Using "Space" as shortcut conflicts with the Terminal and is still slower than simply just opening the file...

The i18n() string is still part of the code, so that it could be reactivated during the 4.2 cycle.