[jboss-as7-dev] Dynamic configuration?

Under versions prior to AS7, it was possible to add data sources and login configurations via appropriately structured XML documents in an EAR file's META-INF directory. AS7 does not appear to support such dynamic, per-application configuration. That is, as far as I can tell the only way to add a datasource or login config is to edit the central standalone-xxx.xml config file. Is this correct? If I'm wrong and there is a per-application configuration strategy, then are there examples of how to perform the per-app config?