If you have any criticism about official xpam gproxy feel free to drop me a private message or add me on skype and we can chit chat about it. We know our gproxy is not even near perfect but we can only do as much as we can with the amount of people and time in our hands.
If you feel like you can contribute to some parts of our gproxy and make it better feel free to share some of your code with us. There are still a lot of problems to solve and things to improve so every help is welcome.