Hi Jeff,
Can you post how you were able to download the source and how one might apply the patch? We're using the RobotBuilder for the first time but we program in Java. We were able to get things working with a 4 motor CAN system by using CANJaguar in the builder and then changing the imports from CANJaguar to CANTalon. Not the best since we have to do this every time we generate code. There are ways we could overcome this using hooks in Eclipse, but your solution would be ideal.
If you haven't seen them yet, the tutorials on the RobotBuilder from WPI are AMAZINGLY helpful. You can find the first in the series of 6 here...
https://www.youtube.com/watch?v=k7PaYcjDEDc
...my favorite is the second in the series where they show all the amazing stuff you can do in test mode if you've used the robot builder.