I need to be able to open about 16 JPGs in Chrome all at once, without having to select each one and do Open With.
You have the Google Chrome shortcut icon, you then have all JPG filez selected in another window beside that, you then drag all those over to the Google Chrome shortcut icon, and all those JPG files will open with Chrome.
This gives you just what you ask, select all applicable JPG files, and then open those up with Chrome without needing to select the open with option.