It's being discussed for sure, and the desire for sliders has been heard. That's really all I can say at this point, our feature set for the sequel is far from being decided upon.
A lot of people think sliders are easy, and in some ways they are but they really add a lot of complexity to testing.
Even something as simple as a sim mode and an arcade mode doubles the amount of testing needed to be done on a game, doubles the amount of tuning, all that stuff.
Giving access to arbitrary sliders gives the end user the ultimate freedom, but makes the testing matrix huge.
I'm not saying it won't be done, just giving insight into why it wasn't done for this game.