Same here. Those files don't need to be changes. You can pass all necessary data through parameters or environment variables.
For example, to change GITHUB_CALLBACK_URL, while using you own Github credentials, do like this:

    $ export GITHUB_CALLBACK_URL=myooindexapp-mynamespace.rhcloud.com
    $ ./start-devel.sh  MY_GITHUB_CLIENT_ID  MY_GITHUB_CLIENT_SECRET