There is a separate mailing list to discuss development ideas and issues.
For developers the best way to use PsychoPy is to install a version to your own copy of python (preferably 2.6 but 2.5 is OK). Make sure you have all the Dependencies, including the extra suggestedPackages for developers.
Don’t install PsychoPy. Instead fetch a copy of the git repository and add this to the python path using a .pth file. Other users of the computer might have their own standalone versions installed without your repository version touching them.
Happy Coding Folks!!