Up until 8.1.0CR1, when creating a new datasource in the web interface, the deployed JDBC drivers (deployed as JARs, using the web interface) would show up in the "Detected driver list". After 8.1.0 final (and 8.2.0 final) they don't anymore. I tried mysql, postgres and oracle jdbc 4 drivers.
I don't recollect seeing this as a expected change, neither in the JIRAs nor the release notes (I might be wrong though). But I think it might be worth to create a JIRA WildFly - JBoss Issue Tracker with relevant details.