I have the same question.

I know this isn’t an answer to your question but I did notice when one exports to a stereo out, SD3 first exports each track individually (each individual track does have the name of the source track), mixes together those individual tracks, then erases the individual ones and leaves just the stereo composite track. I wonder if this multi-step process somehow prevents the final stereo track to be named specifically when initiating the export process.

If there is no way to define the name of the stereo composite track on export, many DAWs allow you to rename an audio file from within the DAW (the actual file name on the drive; not just the DAW the reference name); it’s not the best solution, but it is a workaround so you can have a drum track file with the name you want. Just make sure the file is not used in other DAW sessions, or they won’t be able to locate the file anymore (though many DAWs allow you to repoint the file or clip reference to another file, so even there, you can get around the problem as long as the file start point and length have not been changed).

Or, if you are exporting from the standalone SD3, you could rename the audio file in Windows Explorer or Mac Finder before importing the file into your DAW.