I am not a Mac user anymore, but when I was I used Homebrew a fair bit. A Homebrew package would be great and there has been an issue [1] for it for a little while.
Adding the Git version to README is a great idea. I will have to do some research on when the `sequence.editor` option was added. An initial check [2] makes me believe it will work with Git > 1.7.8, which was over 7 years ago.