Unrewarded quality posts from new low reputation, low follower users is definitely an issue but any code change leaving the system open to be exploited or gamed in another way is probably just going to create more problems.

If the original poster still has low reputation and low visibility, is there any reason why it'll get more rewards the 2nd time around?

If they've built up reputation and following since the original post then I'd agree with stevescoins. Leave a comment, encourage a re-submission/revision and resteem that. It doesn't need a code change and I think it's totally legit way to achieve the same goal for someone who's produced good content while undiscovered (pick me, pick me! :p)