Ok, well if the "on" switch on the provided audiovox is neutral return then there shouldn't be a problem with using the "on/resume" button on the Ford controller either.

If you wanted to always have the system on, I was recommending the following: Connect the red wire to the brown wire on the servo side of the audiovox connector that goes to the controller. (this could be done at the connector or at the servo). However, since the provided switch is neutral return, NOT toggle, then I would recommend bringing the brown wire from the servo and connecting it to the brown wire on the Ford controller. This means you will have to turn the system on each time you want to use the cruise control...but this way it is emulating the provided controller in the same way...which is probably the best way to go.