> If I'm producing both RAW and JPG for each camera image, it would be advantageous, when quickly going through the images after they have been loaded from the camera to the PC, to have an option be able to have next go to the next JPG rather than go through both the RAW and JPG for each image. JPGs load in about half a second - RAW images take anywhere from 5-10 seconds to load, depending on which camera produced the RAW.
Try sorting the directory by file type first, then by name.