PoB reward is 65% of the reward pool, for content creator(32.5%) and curator(3.25%). The content creators can be voted on their posts, comments, etc.

Not really sure, that seems low considering there are no POB miners. What happens to the other 35%?

Is it possible to reserve 5% of the reward pool exclusively for comments. At this point of time, it includes all and it is purely at the discretion of curators to vote a post or comment.

Not without custom code or a benecifiary account that does separate voting.

So, if by an amendment 5% of the reward pool will be reserved for commenters, how difficult it will be to code it?

That's something that would have to be coded by the Hive Engine team as they control the code that does the distribution for Tribes. There are ways to do it outside of that in a round about way which are easier.

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