Since two days there is a new module in systemsettings: workspace under the Desktop category.
Here is possible to switch between the Plasma desktop shell and the netbook shell. the switch will be done on the fly (no need to restart KDE) and it will be remembered the next KDE start.
Plasma desktop will close, Plasma netbook will start and some different settings on KWin will be applied: windows will start as maximized and there will be no border for maximized windows.
The other section is Dashboard: is now possible to configure from here if you want the dashboard with the same content of your desktop or if you want it to show an independent set of widgets.
In the same way, in the Multiple desktops section, is now possible to decide if you want a different plasma activity for each desktop, so the quite hidden config dialog reachable from the zoom interface for those two options has been removed.