By accident, I discovered a way to keep the hill-start assist control (HSC) activated for more than 2 seconds before it switches off.
- Activate HSC as usual by pushing the brake pedal to the floor, waiting for the beep and then getting the VSC light coming on.
- Reach down and press the VSC Off button before the HSC deactivates.
The brakes will hold the car for longer than 2 seconds (I'm not sure how long as I had to drive off after about 5 seconds).
I don't know whether this has any negative effect on the car at all. I'm interested to know if anyone else can duplicate this.