I’ve seen a drastic drop in referrer-spam and I’ve made a few minor changes to my writebacks plugins to close comments after 14 days, so I’m going to enable the plugin again and see what happens. I think I’ll make a couple more improvements yet and I want to see if it all works as I think it should, so I’m going to hold off making my adjustments public just yet. When I’m happy that it’s all working I’ll post the code in case it’s of use to anyone else.