[OAC_Sparky]

To get around PATS you could tape the chip from your key inside the steering column next to the PAT sensor. You can also get around the locking steering column by filing down the locking pin.

The crux of the problem is that the true keyless start system in many of the newer cars is directly integrated into the ECU of the vehicle and the "key" of those vehicles has a RFID chip that automatically puts the car into "RUN" mode when that key is within range. The start button is then enabled and the system then basically operates the same way a remote starter system does. Pushing the start button sends the command to the ECU that runs the whole startup sequence just like your computer when it boots up.

To make a "push to start" button is fairly simple but unfortunately in the Focus the ECU isn't capable of a true keyless push-to-start system; you would still have to turn the key to "Run" (unless you want to have your car in "run" all the time lol) and turn the key to "Off" to shut the engine down. So all you really have then is a fancy button to crank your starter.

And in the end, you have to decide for yourself whether this is all worth the effort. Since you already have to turn the key to "Run", what's another 5mm turn to "Start"?