I love rebase (I'm a tip-of-master-only person, no merges ever, squash all your commits with `rebase -i` before pushing and write one good commit message for the group). But there's one really, really irritating thing about them:

You should not be able to use `--amend` during a rebase.

For me editing all my changes onto the commit I'm working on with `git commit -a --amend` (or as I've aliased it, `gcaa`) is automatic; I do it 500 times a day, just to save my work. But I can't count how many times I've been in the middle of squashing commits and accidentally typed `gcaa` and amended someone else's commit after fixing a merge conflict, and it's super annoying to unwind (if you realize after typing `rebase --continue`) so usually I end up just giving up and starting over. I really wish amending to a commit that wasn't one of the ones you're rebasing was just totally disabled.

I guess there are some other small complaints, like the annoying reversing of `--ours` and `--theirs` from what makes sense (yes, it makes sense if you have the internal model of rebase instead of the intuitive one, but that's stupid), rebase's tendency to pick the wrong parent commit if you've accidentally amended someone else's commit (and therefore lag a while and then produce a rebase log of 1000 commits or something), and the utter tedium of editing the rebase log to replace every instance of "pick" with "s" for squash except the first, since almost 100% of the time what I want to do is squash everything (and use the last commit message, not the first, and definitely not all of them munged together which is the default).

I would love a separate command or a flag, like "git rebase --tip" that does all of this automatically for my otherwise extremely elegant workflow (and I'm gonna be really bummed if it turns out it exists and I didn't know about it for the last 5 years...).