I gave you bad information. I just did an ingest using {type} and it does separate video and still but the NEF files and JPGs are in the same folder. So, here's another possibility. Once the files are ingested, turn off the option to combine RAW and JPG in the View. That's Ctrl-J in Windows. Now go to the sort option at the top of the screen and select Sort by {type}. That will group the images by JPG and RAW making it easy to select the JPGs and delete them since they are now all together rather than mixed with the RAW files. Sorry for the bad info.