[Kevan]

OK, what are we supposed to be looking at that's different?

[BAracer]

Colour coordinated knobs! 

Red = brake related
Yellow = min/max speed
Blue = the other one

[Kevan]

Blue = the other one

'the other one' 

I like to think of that one as a traction control or rate of acceleration

Yes, does look better, can't see why S.I. don't do that as standard 

[DPJ]

It's called Exponential in the RC world.
It's a curve adjusting function that logarithmically changes the power delivery in response to trigger position. It can be adjusted from mild to quick.

[BAracer]

Yes...Power Trim to give it it's proper title. 

Read through the manual again and it's a clever knob. It only kicks in if you pull the trigger quicker than the PT threshold you have set...it's not just a constant cap on power delivery.

[Kevan]

Yes, you only really feel it when you nail the throttle, it's the perfect way to tame a car on skinny tyres when smooooth is preferred.