[bugg?]Super key in KDE menu shortcut

Hi all
my KDE is 4.3.2 from repository :
http://download.opensuse.org/repositories/KDE:/43/openSUSE_Factory
I run KDE menu editor and found my application for example firefox
and want to assign to it shorcut <Super(Win)+B>
But I only able to make shortct with Ctrl, Alt, Shift
please confirm somebody

WBR