When a JDBC driver is auto-enlisted in the Aries transaction manager there are additional options that can be specified when exporting the javax.sql.XADataSource instance as an OSGi service.
These options can control the pooling of JDBC connections.

Most (if not all) of these options are listed in
https://github.com/apache/aries/blob/trunk/transaction/transaction-jdbc/src/main/java/org/apache/aries/transaction/jdbc/internal/ManagedDataSourceFactory.java#L94

Lets make sure we document the possibility to configure the connection pool and the other options.