It is recommended to not use such -ds.xml deployment in production as mentioned.
mention it under the "Developer Usability Enhancements" section
Also the way to configure JBoss AS7 goes in the direction to use Web-Admin and CLI interface and not change the XML configuration (ok. some initial configuration are necessary).
I would use the CLI interface for the installer to add datasources, or even other stuff. This ensure also that the changes are validated before applied and you might do this as a batch job which can do this as all-or-nothing.