At this point it has pretty much been a one man project. One guy has contributed a few examples and another made some improvements to the nodeJS version of Breakout Server but for the most part it has just been me. It builds on an older AS3 project that I was a contributor on so that made things a bit easier than starting from scratch.
By contributing a better scope I assume your referring to the SignalScope module (src/utils/SignalScope.js). If you want to contribute you should open a new issue on the Breakout github page: https://github.com/soundanalogous/Breakout to propose your contribution.
If you’re not already a Github member you can create a free account. It will be helpful to familiarize yourself with Github as well (checking out code, making pull requests, etc). See the Github Help guide: https://help.github.com/.
The way this would work for contributing to Breakout is you would fork the Breakout repository. Then you would checkout the Dev branch and create a new feature branch from the dev branch
git checkout -b better-scope for example. When you code is ready for review you would submit a pull request against the Breakout dev branch.