The cam timing is controlled via the ECU. On the Contours the ecu is programed to alter the timing of the exhaust cam under certain circumstances (probably some huge formulaic "if this: then this" table with variables for load, throttle position, engine speed, and OBD-II input, and probably a bunch more stuff)in order to have the least possible amount of emmisions. On the SVT Foci the intake cam is varied by the ECU in order to increase performance based on a similar but different table. If you want the VCT on the intake cam you would just have to buy a focus engine and ECU. If you want it on both you should buy a honda :p
In my opinion VCT is just another way to make tuning an engine more complex. My car doesn't have VCT so all need to do in order to time my cams is buy a set of variable cam gears and get on a Dyno. If I had VCT I would have one of two options. 1) I could ditch the entire VCT assembly and put on an adjustable cam gear(and live with the CEL on for the rest of my days) or I could try and hookup some kind of piggy-back ECU like the greddy E-manage(there is no guarantee that you could control ford's VCT system with the Greddy like you can control hond'as VTEC. The greddy(or any other electrical tunig device) in my opinion is the much more compicated of the two.
