It's a new project and a review feature is most likely not on the short-term or even mid-term horizon (as implementing it in a decentralized manner is nontrivia

It's a new project and a review feature is most likely not on the short-term or even mid-term horizon (as implementing it in a decentralized manner is nontrivial) but it could be nice if you fleshed out a more detailed feature request over at https://github.com/headwaymaps/headway/ https://github.com/headwaymaps/headway/ - it checks your other boxes.