Can I temporarily give users rights to add a HKCU registry key through active directory, and after the key is added disable the rights?

I want to add a REG_Expand_SZ key to this path (HKCU\software\Microsoft\office\14.0\common\general\ for all users when they sign onto their computers.  However, we have restricted user access to edit their registries

Is there anyway through active directory that I can enable them to edit the registry after logging on to add this key, but then disabling it again after it is added?