I am not a fan of multi-mode. I want my fronts working when I go into a slippery turn and understeer is imminent. For me at least such things can take me by surprise. Icy surface in the shade around the bend. Same for radar cruise. Far more alert than I am for a child or a deer or a drunk. I will take all the help I can get.
Yeah, it is always better to have power everywhere, but in the instances above, I am not sure if having power to the front axle will help that much. I think that VSC (stability control) is the thing that keeps you from going off the road, rather than power to the front axle. Once a slip is detected, power is cut to the throttle...and then individual brake(s) are applied to keep you going in the direction of the steering wheel. I am not sure if power to the front wheel will make that much difference in your situations. BUT, i guess maybe the power to the front axle could prevent it from slipping in the first place??