Darn, I really thought submission rates were the lowest hanging fruit for bot detection, and it doesn't appear this is the case.

Thanks for commenting so I could see this.

For what it's worth, penalizing submission rates is not the default in the plugin itself, that's just for the demo. And also, in my testing, HN at large has "high trust" practically everywhere. My own account is consistently one of the lowest scoring that I come across, ironically. So perhaps this plugin isn't as useful as I had hoped.