If you are interested in helping us develop pypentago, you should fork this repository. Be sure to not do unrelated changes in the same repository, as we might not want to merge in all of them. This means create a separate repository for every feature you implement. So you know this cool feature to implement, fork pypentago-mainline and then, once finished with the feature, do a pull request. It would help us a lot if you could specify what you did in there.
Please note that you are expected to run the unittest suite and that it passes. Also, you should write tests for your new feature.
If you develop, always be sure to comply to PEP8.
Join us at #pypentago on irc.freenode.net.