Yes, I would recommend using the Dali functionality within WTP to build a
RCP application using EclipseLink JPA. The Ganymede version of Dali
offered support for simplified configuration of many of EclipseLink JPA's
advanced features.
The Workbench is only provided for compatibility with those customers
using Oracle TopLink's classic API and metadata. Developers using JPA and
the Eclipse IDE should not need to use this utility.