Hi, and welcome to MINI2.
DSC actually stands for Dynamic Stability Control - it has the ability to apply the brake to individual wheels to help you regain control in a skid situation. It's a very clever piece of kit, and well worth having from a safety point of view.
The Mulit-Function Steering Wheel (MFSW) option combines both volume/stereo controls with cruise control - they both come with the same option. It's a desireable option to have, and potential problems with these are extremely rare.
Best of luck with your decisions, and Happy MINIing when you finally get one!!
Jon