Comment 1 for bug 568401

When I open Keyboard Shortcuts, and press S or M when assigning a shortcut to an action, the following message appears:

  The shortcut "S" cannot be used because it will become impossible to type using this key.
  Please try with a key such as Control, Alt or Shift at the same time.

So Gnome at least sees the key presses correctly, without any modifiers. Furthermore, the indicator applet doesn't open when I try to assign the shortcut.