Wow, that's a lot to take in : )

Thanks for the contribution, for the support of this feature and also for getting involved in the Roadmap2018, that's how a community grows.

As for the last part, related to how comments can be displayed leveraging many visual forms of attention-grabbing, this is at the UI level and I think it deserves a separate discussion. My proposal is at the core blockchain level, on the backend, and I think we shouldn't mix in UI components.

Other than that, I really like the idea of different UI options for comments (premium slots, for instance, displayed regardless of the votes received by a comment, etc).