You are aware of the fact that you can use the Ctrl-Key when clicking on files to select and deselect multiple files and the Shift-Key to select an adjacent range? If that's not enough try a decent file manager utility to select and copy files to a working directory.
You could take a look at Total Commander
When in doubt..... Press the shutter.
I'm sifting through 600+ images to return 100 selected images. It's not feasable for me to be holding down the control key and clicking each image. That's what I'm saying here.