This seems relatively easy to fix, and would make following the development process that much easier.
I'm pretty sure this is not supported in gitweb. If it has some actual plugin functionality that would be something we could use but I'm not sure we want to fork github just for that functionality.
Previously committers have just pasted the full link I think - which would be easy enough to go back to. Certainly a lot easier than actually forking gitweb. And it would then also work for all other places that render the commits, such as github or just your personal "git log".