The car queuer role screen says that it is keyboard enabled, and describes the number box being color keyed. On my host laptop, running Win8 and a touchscreen, the keypad doesn't work and the number box does not change color. I can use the on-screen touch buttons, but not the keyboard.
I will have to verify, but I also recall that the keyboard was disabled on the Win7 netbook we were using to assist. We had to mouse click on the on-screen numbers.