WOW, Caty! I was going post this crummy answer:
@x-trail
That function is only available if an EU locale is selected, and then voice command won't work here in AU or for that matter in PH for Kevin. Also, by changing the SLI i don't think that will alter the speed of the car in simulation, even if an EU location is set (afaik).
But your 'Directing Staff' answer is so comprehensive, you should go to the top of the Class Caty .... oh, wait, that's right, you're already there ...

One thing though, which answer's right with the car speed in simulation? Maybe x-trail's right and it works but only if both EU map and locale is used. I know it won't work on an AU or US map regardless of locale.