(2) A lot of good ideas there!
(3) I have, but we have over 30 journals and only a few want these changed. While figuring this out I found the file where these are hard coded and if I recall correctly if would be fairly easy to add a hook there to enable renaming via plugin. I will try to look for that again.
Edit: The function I was remembering is here:
Simply by adding a hook before
return $reviewerRecommendationOptions you could already do a lot. As I said, it is not the functionality but the naming that seems to be the question.