I would suggest some kind of white list for the 20 second comment rule, or maybe dropping it to 15 seconds.
Eliminating it will result in a spam attack from hell, imo.
Bad actors have already circumvented this in the past with multiple accounts. Many of those accounts using SP delegated from the faucet.
Ouch, maybe we should bring back the n2 and teach the minnows to dogpile abusers?
Maybe with a sigmoid function that keeps the whales from sucking it all up.