That's all fine and sounds great, but I suspect 30-45 seconds makes an infinitessimal difference in your core temp.
Placebo or real, I've had a PR with each R-W-R distance race. Try it out if even for some training runs and keep an open mind. I was anti-RWR because any time I had stopped in races before, it meant I was fading. I finally have it a shot (and took a good 4 runs before it felt mentally okay to walk) and haven't looked back.

I race with R-W-R and had a PR of 1:27 with it and plan to use it in an attempt at my 3 hour marathon (will be my 8th marathon but first R-W-R). It helps my core temp in check and a good reminder for hydration and nutrition.

This was always my understanding as well from reading all of Bobby McGee's work. If I remember correctly, he hypothesized that unless you're faster than 2:30 (maybe it was 2:35?) in the marathon, then taking very brief walk breaks would almost always yield a faster result than running the whole thing. Rests/Resets of walking even 5 seconds are enough to reduce neural and muscular fatigue before beginning again. In my own practice, I used it in a couple of 50 mile Ultras and was pretty happy to pick people off in the back half of each race by just keeping steady. When I came back to tri a couple of years ago I've walked for 5-15 seconds every aid station and dropped a couple of sub 1:30 runs in 70.3's, which I had never done before. It's worth noting that the walking should be practiced - I'd wager that at my slowest I'm still walking 10:00 to 10:15 miles.

The argument against run/walk is there really isn't a way to PROVE whether it's faster or not. I know that my run splits are better by doing it. You know you picked off 10 plus people in the back half of UM this year to grab the win by doing it. But, people can always conveniently argue that you (or I) would have gone faster on those specific days by running the whole thing because there is no way to prove otherwise, because you'll never have the exact situation again.

EDIT: Nice win, by the way. I've followed your blog and postings for the last couple of years - impressive!