As discussed at https://community.jboss.org/message/617978, jtds is a jdbc 3 driver, hence the following needs to go to standalone.xml.
<driver name="JTDS" module="net.sourceforge.jtds">
<driver-class>net.sourceforge.jtds.jdbc.Driver</driver-class>
<xa-datasource-class>net.sourceforge.jtds.jdbcx.JtdsDataSource</xa-datasource-class>
</driver>
It will be great if someone can post a sample how to do it with jboss-as-maven-plugin.