what exactly does the click on the gas pedal do?

 

Tells the transmission to downshift to the gear which will provide the most torque for the given speed.

 

You must have an automatic.
I don't think that 'feature' exists on the 'proper' manual version!!!

 

There was a thread on this quite a while back. The manual give a bit of a cryptic description of it but I think the idea is that the switch commands a WOT condition, independently of whether the throttle plate is actually fully open (with the drive-by-wire system the throttle doesn't necessarily follow the pedal), for the transmission to respond to the driver's demand for immediate acceleration - basically a kickdown!. So it’s only present on the auto like spensley remarked.

https://www.crossfireforum.org/forum...t=kickdown#top

 

The kickdown simulator is not used as a "kickdown switch". Wide Open Throttle (WOT) recognition takes place over the signal from the accelerator pedal position sensors pressure point, which is located in the pedal assembly. WOT position is simulated before achieving the full load position.
This is from the CF service manual.