This is cool, but has anyone ever needed to rewrite commit authors or dates?

Hmmm, this seems to be making easy something you normally should not do.

Extra points for the name.

This looks cool! Are there screenshots available?

I built a small Tauri app that just shows your commits in a table and lets you edit message/author/date directly, plus find & replace with regex if you need to fix a bunch at once. It backs up the branch before it rewrites anything doesn't touch file contents, just metadata.