Need to restart unity to activate changes to Custom Shortcuts (Settings => Keyboard)

After changing the Custom Shortcuts (e.g. adding a new entry), I need to restart unity to make it effective ("unity --replace &!").

This also affects changes to existing config entries: if I change them, the previous and new combination both are not recognized (until I restart unity).

TEST CASE:
1. Open Keyboard / Custom Shortcuts
2. Add a new entry or change an existing one
3. Press the new shortcut

ACTUAL RESULT:
Any changed hotkeys (added or edited) are ignored, until you restart unity.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity 7.1.2+13.10.20131014.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
Uname: Linux 3.11.0-13-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
CompizPlugins: [core,composite,opengl,decor,resize,compiztoolbox,put,vpswitch,snap,mousepoll,regex,place,session,move,grid,animation,imgpng,wall,expo,unitymtgrabhandles,workarounds,ezoom,staticswitcher,fade,scale,unityshell]
Date: Mon Dec 2 06:56:10 2013
InstallationDate: Installed on 2012-05-28 (552 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
SourcePackage: unity
UpgradeStatus: Upgraded to saucy on 2013-10-08 (54 days ago)