Is it possible to batch delete documents (on a dev environment)?

I need to switch our test environment to JDBC file storage but I cannot do that because we have almost 1 million documents in the environment (which were imported to test search performance). Is there an efficient way to batch delete documents. The repository manager only lets me do 2000 at a time and the Archiver requires a lot of space on the file server because documents need to be exported before deletion.