This is a super great project! I think it is a really clean rewrite of bumpversion. It is also really nice to have support for pyproject.toml. These days there are so many configuration files.
It would be nice to be able to pass in command line arguments in the pyproject.toml file. I think you could do it nicely if you had a [tool.tbump.options] heading. Then you could pass in something like patch-only = true .
It does not look too hard. I could add it if you are interested.