I don't know who needs to hear this where, but being able to sort a user's comments by controversial would be a quick way to get a gauge on how generally inflammatory a user is when moderating one of their comments.
People get downvoted by others who disagree with them or just don't like what they said. The same comment would get upvoted in one community and downvoted in another.
I don't think sorting a user's comments by controversal is going to get you the data points you think it will.
I still think it would be a cool feature, mostly for the novelty of it, but I do not believe it will be anywhere close to a measure of how inflammatory a user is.
I'd also like the ability to sort a user by the number of upvotes v. downvotes they hand out, maybe compared with the number of posts they make. There's a strong correlation between a serial downvoter and toxicity, in my experience.
I'm not saying I doubt this, but I would like to know what data points you used to get to that conclusion. What platforms do you have access to where you can see how users downvoted in order for you to have concluded there's a correlation between serial downvoting and toxicity?
Mostly anecdotal; I may be wrong, but I see a lot of toxic folk who enjoy their downvoting. Seeing it put into a table might be interesting, especially if we could use AI to detect tone / toxicity.