This video will show you how to mod your controller. Send a message if you have any questions.
P.S. I got all my supplies at radioshack. Rosin-core solder, mini screwdriver, wire, momentary push-button. Those four total about $10-$20. And yes, the normal trigger still works like it always used to, a plain old trigger. P.P.S. I'm sorry, but i had to remove the comments, cuz people were putting some stupid stuff up there. And I am not responsible for any damage done to you or your controller. Enjoy.