In terms of temperature stability, for short periods of time (say about an hour at least ) a kettle is probably far more accurate than your home oven.
A year or so ago when I got tired of people complaining about their stokers oscillating ten degrees, I ran a test and put the probes in my oven. The temp swings are huge- above 25 degrees then under 20 degrees, rinse and repeat.
Point being, yeah, you can cook anything in the kettle! At least as well as in an oven!