backwards menu-complete with shift+tab

[gph9mail-bashbug]

Configuration Information [Automatically generated, do
not change]:
Machine: i586
OS: linux-gnu
Compiler: gcc -I/usr/src/packages/BUILD/bash-3.2
-L/usr/src/packages/BUILD/bash-3.2/../readline-5.2
Compilation CFLAGS:  -DPROGRAM='bash'
-DCONF_HOSTTYPE='i586' -DCONF_OSTYPE='linux-gnu'
-DCONF_MACHTYPE='i586-suse-linux-gnu'
-DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale'
-DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H   -I.  -I.
-I./include -I./lib   -O2 -g -m32 -march=i586
-mtune=i686 -fmessage-length=0 -D_FORTIFY_SOURCE=2
-D_GNU_SOURCE -DRECYCLES_PIDS -Wall -pipe -g -fPIE
-fbranch-probabilities
uname output: Linux delta 2.6.18.2-34-default #1 SMP
Mon Nov 27 11:46:27 UTC 2006 i686 athlon i386
GNU/Linux
Machine Type: i586-suse-linux-gnu

Bash Version: 3.2
Patch Level: 9
Release Status: release

Description:
This is GNU bash, version 3.2.9(1)-release
(i586-suse-linux-gnu), using vendor supplied package
bash_3.2-7_i586.rpm.

With the documentation at hand, I cannot figure out
how to bind backwards menu-complete to shift+tab. The
manual says:

menu-complete
  Similar to complete, but replaces the word to be 
completed  with  a  single
  match  from  the  list  of  possible  completions.  
Repeated  execution  of
  menu-complete steps through the list of possible
completions, inserting each
  match  in  turn.   At  the  end of the list of
completions, the bell is rung
  (subject to the setting of bell-style) and the
original  text  is  restored.
  An  argument  of n moves n positions forward in the
list of matches; a nega-
  tive argument may be used to move backward through
the list.   This  command
  is intended to be bound to TAB, but is unbound by
default.

The notation
    bind "TAB":menu-complete
in my ~/.bashrc works as intended, this overrides the
default complete.

Repeat-By:
However,
    bind "a":menu-complete -1
or
    bind "a":"menu-complete -1"
work exactly the same as menu-complete, i.e. they go
forward when I press a.

Specifying the key combo shift+tab is not documented.
I guessed if M is meta and C is control, S should be
shift. I tried
    bind "S-TAB":complete-username
but then pressing shift+tab has no effect, and tab
alone triggers complete-username. 



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