On my 2005 explorer (the expy might be different but probably shouldn't be that different):

push RSC button and release: braking traction control mode
push and HOLD RSC button for at least 5 seconds: everything off. The "off" light in the button will flash. It might engage if a very high threshold is reached, but luckily I've never had that occur.

4X4 auto and high: does nothing; uses whatever setting the button is in
4X4 low: automatically goes into traction only mode. You can shut this off by holding the button as explained above.

Trust me, I've tested all these settings in a snowy parking lot. This is what mine does.

I agree though- if I'm in an intersection about to get t-boned I would rather skid and be able to accelerate than have my throttle cut and get t-boned.