Kbin does allow downvotes from what I can see and downvotes doesn’t really bring it to a toxic environment as it’s just a way to easily disagree with someone without having to go into depth in the comments. It’s like YouTube videos, if you dislike it doesn’t mean it’s bad, it just means you personally don’t like it.

Nap time?

I would say it depends on what your community is about, If it’s a topic that could get a good amount of users flow to it you’d probably have a lot of work on your hands and might need to add another mod or something but if it’s that unique maybe only a few people would use it, I wouldn’t bother with the mods and just run it yourself.