The buttons are honestly a minor detail, there are various options - how OE it can look, I am not sure. The only way CC will work on our cars is with a servo cable pulling on the throttle body, in parallel at the TB, or back at the pedal. OE systems typically are not centralized and therefore very specialized, it would probably take a Ford CC engineer with time on his hands to figure it out, if even possible with any existing parts. Keep in mind when thinking of other cars as sources - this is not just about being cable driven, but also being completely in parallel to the TB. Cars with traction / stability control that I have seen have a servo that intercepts the pedal cable, which also drives commands from the CC and traction control - if we get into this it will be a real mess with custom cables etc maybe even custom electronics to match. Look at our traction control system - the aftermarket one is enough of a mess - who wants to even think of going OE?
The primary problem with CC is a processor and servo actuator. That is what the Rostra unit gives you, in one package. This is not some ancient vacuum based thing - it is 100% electronic (w/ VSS input) until the cable output. The generic instructions are here:
http://www.rostra.com/manuals/250-1223Form4565E.pdf
Of course they don't mention it for the FGT, who outside of us would think we are crazy enough to want this? All that really means is no one figured out which throttle cable bracket to use, as you are adding a cable in parallel. They have generic brackets but I suspect if we find our OE TB cable bracket came on another car, they probably have a conversion bracket for that application that will work just as well for us. In looking at the "Ford" connection on pg 13 I think it can actually be done by drilling a hole in our bracket beside the current one and holding their housing with nuts, as I realized last time that the outside of their cable housing can be threaded (see pg 15). The tube clamp would be needed to connect it at the end, not ideal. It does appear that this could also be done under the dash at the pedal as well (see pg 12), but that could be a tough job though totally out of sight. As far as the CC system is concerned, this is a regular V8 car like any other. Their system has dip switches to change the sensitivity and damping rate, etc, but I found the defaults fine last time. Yeah this will not look very OE, but it will actually work without getting extremely complicated.