I also tend to use VPower or the BP equivalent - BP Ultimate, is it? Like you I'm not sure if it needs it.
Worth noting that although the gearbox will downshift by itself if you're slowing to a stop then it's worth dropping into neutral from second (by pulling both paddles back) rather than letting the car go from second to first. This will help preserve clutch life. You'll notice that the car is a load easier to drive smoothly in normal mode than it is in sport. The latter can be quite aggressive in the up and down changes, and certainly deliciously noisy. There's a time and a place for it and sometimes you may need to use stealth mode. But probably not often.
On a similar note, the car always starts with the valves open (which sounds great, even at 4am... but your neighbours may not agree) and then they close a few seconds later. Whether the car starts in sport, stealth, manual or auto seems fairly arbitrary. Mine seems to defaul to stealth auto. Never use auto. It's rubbish and it eats clutches.
Oh, one last thing, when cold the 'box won't change up below around 2.5k revs.
Enjoy!