Today I finished up the controller by adding map & view buttons as well. To wire these do the same as with the other buttons, they all use the same grey wire as ground. Here are some photos of the location of the wires you need to cut & connect to the buttons.
http://lh5.ggpht.com/_wL3f1bGat8Q/Sn...1249250717.jpg
http://lh6.ggpht.com/_wL3f1bGat8Q/Sn...1249250832.jpg
And here is the finished product.
http://lh5.ggpht.com/_wL3f1bGat8Q/Sn...1249251140.jpg
This is a great way to turn an almost useless stick into a really comfortable custom setup. It is not that hard to do (believe me I'm no electronics expert) and less than $10.
Have fun!
Rev
