Which is tragically amusing, since arguably the main reason why the source was made available in the first place was to support forking.

Open source software is simultaneously in great health and badly badly broken at the same time.

You can just fork and then ask for your changes to be pulled into their own tree.

That's called contributing via a pull request isn't it?

But my fork is better than yours because it has the feature I wanted and you rejected ...

So maybe you should be integrating your work into my project.