How does this new method relate to _threadsToLoadObjects_? As a first gut feeling I think _thread_ is a bit overused here, but I need to think a bit more.

Another thought (which admittedly would break the API) would be to group operations. For example I would find it nice if the ORM specific settings are somehow grouped together, _massindexer.ormSettings().cacheMode(mode).batchSize()_. Just a thought.