The "RT-Button" has no function. Normally it should create a shield or something like that. I do not know exactly, but the game told me while I play the game.
I use Win7 64Bit and the Logitech F710 Gamepad (works with XBox-Driver). Have anybody the same problem?

That is really strange. I have tested it again and now it works.....do not know why...???

Had that problem with the keyboard, half the time it wouldn't do anything, but I didn't had any trouble with the gamepad