RE: Proposed changes in the Calibrae fork
Your changes seem sensible, but I'd need to know more about the original intent to be sure.
I'd also take a look at what changes the Russian fork has done (Golos?). AFAIK they have two payouts, one after 24 hrs, and one after 30 days, which makes total sense to me as most earning is usually done before 24 hrs anyway, but 7 days is far too short to be able to discover valuable stuff. Ideally I think it should be possible to earn for longer also.
Another thing to consider is built-in language support. If different languages had been properly supported the Russian fork might have been avoided.