I have a `git snap` command that's similar to your `git cam` command with a small twist. The commit is added to a special snapshots branch that isn't checked out. I push the snapshots branch and don't rewrite it, but rather keep it around as an accurate chronological record of things I've tried, warts and all. I also like that `git diff` continues to show the changes compared to the last "real" commit this way.

Edit: I guess my script is somewhere between your `git cam` command and Dura in terms of functionality and complexity.