We’ll get those fixed up! We could possibly replace them with custom links - I don’t think that’s a bad idea! It would enable people to link moderators directly to their own guides.
Something we looked into is using the assign feature from the Assign plugin. We hit some technical difficulties early on, but it’s something we want to look into again, especially now that Assign is bundled in core.
This is also something we’ve discussed as an improvement, but haven’t built it yet.
I like all of your other suggestions (4 through 9)! We’ll do some investigation on our side to see how feasible these are to implement. Thank you for logging feature requests for each of them - it makes it easier for us to keep track of it all 
I recall some recent work in this area - I’ll dig through that and see what’s going on. This won’t be anything to do with the new layout, as the same reviewables are appearing here as in the old layout. It sounds like we could maybe tighten things up there a little.
This is interesting - I’m not sure how feasible this will be inside the reviewable UI, but we can investigate to see what’s possible.
These are reasonable requests - while we could certainly add settings for these, we’ll need to do some research into the best way to make this possible, while ensuring the product remains easy to configure.