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Is there a away without deleting my database to purge all the songs and midi presets without deleting the layouts and custom fields and the midi output devices?
Not in Set List Maker. In BandHelper, the web interface has batch update and batch delete functions you could use. However, deleting all your songs would essentially destroy all your shows because a show is a collection of songs.
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In addition can there be inclusion to add the audio playback files 2x stereo files to avoid typing it in for each song. Add to the Batch import I use the songs for rehearsal?
Do you mean can you include links to recordings in the batch import file? No, I didn't include this because you would have to spell the title, artist and album exactly accurately and for most people it's easier to link the recordings through the interface than to do that. In BandHelper you only have to match the recording filename, so that can be included in the batch import file.