Switching between languages in Fedora 18.

[Kevin Wilson]

Hi all,
I am trying to assign key to switching between
languages on Fedora 18.
With previous Fedora releases, 17 and down, I did it with "both shift keys".
Now, when I go to "Regional and Language settings"->shortcuts,
"Switch to next source" is defined as "Alt+1"
Pressing "Alt+1" indeed change languages; however, it does not let me change
the shortcut to "both shift keys".

Is it possible to set "both shift keys" to switching to next source in
Fedora 18 ?

I use MUTT desktop


Regards,
Kevin