"Goldvoice.club allows authors to pay "cashback" to curators, rShares received are calculated and author can decide which % of reward received going to be transferred back to curators proportional to rShares."
That's very cool. I would certainly have made use of that option. It's nice to offer the extra promotion to those who participate.
"The moral is, there's no need to appeal to developers, all that could be realized by a group of interested users."
I don't see why both options can't be available. Your option, notably, requires trust if using bots rather than a decentralized blockchain, so appealing to developers is still worthwhile. Or, we can simply code the option ourselves and post it to Git.