I skimmed it a bit and I can tell you that I'm not a huge fan of downvotes... but I can also say that it looks like you're only asking for frontend changes and none of this would induce a hardfork on Hive which is good.
I really don't like the idea of just putting accounts on blast and auto-downvoting them no matter what without even looking... although there are certainly plenty of bots that deserve this exact type of treatment.
Honestly what it really sounds like you're looking for here is just better tools for scanning the blockchain and the ability to automate behavior with your own bot that has access to your posting key... which is also a good ask considering it isn't super easy to navigate the chain in this way using traditional frontends.
RE: No Due Diligence