Converting to and from dgn is a pretty common thing.
It would be good to multi-thread the Batch Converter so that it can process multiple files in parallel to speed conversion of large batches of files.
Mstn is going to offer itself up as a 'data integrotor', this kind of productivity bottleneck busting functionality would be a great selling point.
Unlikely as then multiple processes need to be fired up. Microstation opens files one by one and doesn't open files in parallel. Even OpenDesignFileForProgram only opens one file at the same time.