Shortcut for compose key has no effect

[B. Clausius]

1) Open System Settings
2) Navigate to Keyboard->Shortcuts->Typing
3) Change the value to "Right Win" (or any other shortcut in the list)
4) Type somewhere (e.g. gedit, terminal) "Right Win", ":", ")"

What happens: you see the two characters ":)"

Expected: you see the smiling-face character "☺"

I upgraded from Ubuntu 13.04 where this setting was somewhere else and worked.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: gnome-control-center 1:3.6.3-0ubuntu44
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
Date: Sun Oct 20 14:23:18 2013
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2011-10-17 (733 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MarkForUpload: True
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to saucy on 2013-10-19 (1 days ago)
usr_lib_gnome-control-center:
 activity-log-manager 0.9.7-0ubuntu4
 deja-dup 27.3.1-0ubuntu1
 gnome-control-center-datetime 13.10.0+13.10.20131016.2-0ubuntu1
 gnome-control-center-signon 0.1.7~+13.10.20130724.1-0ubuntu1
 gnome-control-center-unity 1.3+13.10.20131004-0ubuntu1

[B. Clausius (barcc)]

Is seems that this shortcut is stored in the gsettings scheme "org.gnome.desktop.input-sources" in the key "xkb-options"

I found this workaround:
$ setxkbmap -option compose:rwin

The other values in the gsettings key are also ignored and can be applied with setxkbmap too.