Hey, Scott! Good idea, that you could use in a pinch. I have the Coleman version of that small lantern and love it for camping (not carried for backpacking though). I also use the Optimus Crux stove, which is even smaller than the lantern.
If I were to carry the lantern with me, I would just as likely carry the stove as well, since it is so small. I wonder what the fuel usage is compared to the 3-4 minutes it takes with the stove.
The lantern might be great for things you don't necessarily WANT to be boiling hot. Hmmm. I would definitely have to have some sort of stabilizing system (rocks, stakes, etc) for the pot or other vessel.