I'm bumping this up because I need this as well.
Thanks to gerb's code I managed to make a -very- crude plugin and a example that passes all Spilgames tests.
You can check it out here if you wish bit.ly/1dP6TJ5
The plugin is very far from perfect, as is mainly copy&paste from the API site. The main problem is that the logos and the buttons are drawn outside the game frame and I can't figure out how to draw them inside and controlling their positions and so on.
Hopefully someone that knows more about C2 plugins can help out.