Yes I agree with John this would be a good feature.
I also have a slightly different but similar request that more than one audio file could be routed to the same output. At preset you can pan 2 tracks, but it would be great to be able to route more than one file to an output.
The use case is when we play live, sometimes the engineer wants all 16 tracks, sometimes they want a submix of 8 or 4 outputs in groups. Rather than re-bouncing all different audio submix, it would be much easier just to have playlists with songs setup each way.
The other possible request would also be to be able to assign a file to multiple outputs, in the use case of a click track being sent to multiple outs for band mates