Many of the commenters seem pretty cranky, but I am very excited by this tool, it's exactly what I need and very nicely put together. I'll certainly be weaving it into my project. It shows the same dense but tight information presentation, use of AJAX techniques, and clean, modern web coding techniques that makes Stack Overflow so popular in the first place.
As a Libertarian, I would disagree with your argument.
Here is the chromium issue, which was quite trafficy:
Issue 66062: ERR_TEMPORARILY_THROTTLED makes web development difficult
I personally hate this 'feature'. I don't understand what it defends against, because someone hitting refresh a few times in a browser is hardly a serious DoS attack. And it got in the way of me (and many others) the first time they rolled it out because the "DoS" it was defending against was me hitting my local test webserver which was returning a 500 because the page code was broken.