Looked more into this this weekend. I wanted something more flexible than zfcadmin-specific configuration, for it to work with any kind of child route... 

See this commit: https://github.com/cgmartin/CgmConfigAdmin/commit/67a0af48d43dc322cfa4a6fe91e2e9820582ecb5
(Empty param will default to the current matched route)

Let me know if this change causes any problems for your setup.