Hibernate Tools version: 3.0 alpha 4

In the old Hibernate extensions, I was able to provide some customization to the hbm2java task by pointing it to a configuration file where I was able to set things like interfaces, naming prefix, base class, concrete class, etc.
I've search the help and the forums and see no mention of this for v3. What am I missing?

Thanks

its a known limitation of the v3 tools - add a jira for your specific usecase .