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It is already possible to turn off curation rewards, even no front-end uses the option and the curation rewards seem to simply vanish (I think). It should be visible how big the curation reward is for a post if there is such a slider. =)
Do you have a source on that? It's news to me. I am only aware of being able to disable rewards altogether.
Yes, here is a post: https://steemit.com/steem/@emrebeyler/hidden-gems-on-the-blockchain-disabling-curation-rewards-on-your-comments
But I'm pretty sure that disabling it doesn't give more rewards, but only nothing for the curators.
Yes, this post might be misleading. I believe after some source review of steemd, it turned out author rewards stays the same.
Interesting. The curation rewards presumably bounce back to reward pool, just like if you vote before 15 minutes.