A few weeks ago I saw a demo of this tool, haven't worked with it but it seems to do the trick for what you're looking for. Nice tool from what they showed in the demo.
ManageExpress iManage
http://www.arcananetworks.com/html/imanage.htm
Not only you could manage the deployments separately but you could create users to manage only certain elements.
There are a couple of links on CCO if you search ManageExpress but for some reason they're not working, they hang on loading the page.
HTH
java
If this helps, please rate
www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate