There are several threads about this already, usually under the name of "Copy Queue", "Batch Copy", or similar.
It isn't possible right now, and there wasn't time to add it to 9.0, but Greg just mentioned that it's likely to be added in a free update to Opus 9 at a later date:
[quote="Greg"]No. We had this on the list but it involves a very deep fundamental design change so it did not make this version.
We have to draw the line somewhere with new versions and the Vista changes et al caused several delays.
But it and several other advanced features are planned for the next update in a few months (which currently is planned to be a maintenance 'update' not an upgrade and hence free of charge.)[/quote]