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It depends what decision you mean. We can all decrease the value of a post with a downvote. But downvotes are not very commonly used for this. But they can...

No. I meant the bigger decisions like how votes are paid out. The split, the dust amount etc. etc.

I don't know that either.

I also suggested to configure a maximum reward for posts. I think would need to be changed in the blockchain. I don't know who decides these kind of changes.
Maybe @acidyo knows.