Thanks, it's available on github:
https://github.com/nshahzad
It can easily be forked, and with push/pull requests, it's easy to merge code in.
There are other's who are writing addons (see the addons forum), and people do send in patches for bugs. But my "real-life" is pretty busy these days (I am a software engineer), I don't get much time. I do have some things on the board, including an overhaul of the financial core which I'm planning (albeit, slowly).
But anyway, the code is on github, anyone is welcome to change and add, and send me a pull request.