1. ts possible to create a datasource for RH-SSO-OCP as a batch file, as described in teh doc.
See documentation: 4.4. Using Custom JDBC Driver
3. The way to follow to update a a JBoss datasource with Openshift (hence RH-SSO with openshift) is described at a solution article:
"How to configure datasource settings in EAP 7 for OpenShift"
4. This current doc section  needs to be updated, as it is a blocker point , which can lead to cases due to this doc bug