Don't know but what you found matched what my 2005 STR does.
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Yeah I'm assuming it's an issue with the STR's as how the previous people posted on their XKR's 15 seconds of holding that button gave them the illusive ability of DSC being completely off. -_- bummer I wonder if a tune/flash of the PCM can fix this.

 

We are pretty much still waiting for a tune too. There are a couple of places to get one but nothing documented before and after so take your chances.

The XFR guys seem to have a great tune and some of them are putting down over 500 HP at the wheels!
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I think they use a TS - which is also available for the STR isn't it?

Some use an LSD.

Some both?

 

I can confirm the XKR's will turn off completely. It's dang tough my Pirelli's though.

 

Mine turns off compleatly with one quick press of the button!
And is defiantly off off! It will ruin a tire in no time generally one at a time
Though ! Some times it will do both heal n toeing! And will pull to rev limiter
In 2nd on cheep hankooks wilst still practically parked !
Not so mutch on sticky bridgestones!
It twists the front of the car up and goes .
It's defiantly quicker and safer in the wet with dsc on
I recon .

 

The owner's manual on the 2014 XF 3.0 AWD (or 2WD) has a section for disabling DSC.
Hold the DSC button down for 1-2 seconds and the dash illuminates that DSC is 'turned off' however as previously posted it will still limit power and enforce braking
Instead, Hold the DSC button down for 10-12 seconds and a chime will sound, as well as the DSC 'off' illuminated graphic on the display panel.
Enjoy what feels like no electronic limitations on power distribution or braking application.
Enjoy

 

Er... wrong forum.

 

lol. Well.. I've turned off my DSC with a quick press, and my car smokes tires in 1st to where on a straight road, my back kicks out completely in all 1st gear. So I'm guessing in my car, the DSC turns completely off.

2003 STR.

 

>my car smokes tires in 1st

Same here, on the autocross course. Car's over-steering while I'm focusing on the cone just in front

Just show'n off, that's all

================================================== ===========
Understeer is when you hit the wall with the front of the car
Oversteer is when you hit the wall with the rear of the car
Horsepower is how fast you hit the wall, and
Torque is how far you take the wall with you