Makkish, in general there isn't much you can do to "secure" your computer using Litestep. There is always a way "out" if you know what you are doing (and it doesn't take much).

But to "hide" the desktop my suggestions would be to read up on the following modules:

button.dll, icondesk.dll, jdesk.dll to show the buttons and then get your shortcut folder when the button is pressed.

Really though, you could just set up an obscure hotkey to toggle the interface, or at least toggle a variable so the button works afterward. That would be just as "secure" your proposed password.