I didn't see any mention of Michael Tapes' "Instant JPEG from Raw". It's a free download for Mac and Windows. http://michaeltapesdesign.com/instant-jpeg-from-raw.html
Just shoot in raw only like you always should. If you need JPGs just right click on the folder and IJFR will extract the full size JPG that is embedded in the raw file. It gives you the best of both worlds. You're already shooting a JPG anyway, why save it again as another file on your memory card? And, when you get that once in a lifetime shot you've got the raw file to work from.
Myself, it is so easy to configure presets in the Library > Export module of Lightroom that it really isn't necessary. My opinion of JPGs, I only use them for E-mailing and display of my portfolio on my iPad. I guess I do put up a few here on this website!!!