In my case, I have three fixed target environments (DEV, UAT and Production), each environment has a snapshot package in Guvnor. In the server side I use the Drools HTTP pull to listen to changes in the snapshot. I move package assets from a snapshot environment to an other only if it passes the target environment tests.
Deployment happen when you take a snapshot "Create snapshot for deployment"; Guvnor gives you the option to overwrite a specific package snapshot - As my target environment server is configured to listen to the snapshot URL then it will load the updated snapshot assets.
This approach worked better for me.
I think using Selectors is not a bad idea but you have to update each asset status every time you want to create a package to deploy.
Abdel
I like the Guvnor package snapshot