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I believe recently Sourceforg added a "Fork"-button to git and mercurial-repositories. Haven't tried it yet, but I think this would allow something similar inside the existing infrastructure
What I really like about the pull request system of github is that zero work is included in organizing teams in transparent way (same goes for bitbucket), and the code review process is fully open and easily done by a lot of people at once - this is what both sites specialize in. I don't want to be the stupid new guy that pushes new things (although I am playing that role very well for now :)), but I really do believe that using those services would make it easier for newcomers to get involved. I've used bitbucket for collaborative work and the part of the web interface that deals with collaboration is way more clear and way more powerful than the one on sourceforge. And since the project is based on git, moving it to github / bitbucket should take like 10 minutes, right?