Even at freeway speeds, if you open the throttle towards WOT, it will send power to the rear wheels (no slip required).
On the Explorer, turning the terrain management knob to snow mode sends some power to the rear wheels almost at all times until 55 mph.
BTW even during hard launches on these Badyear F1 tires, I've yet to encounter axle/wheel hop or excessive front spinning. I've managed 1.8x 60' times consistently with the stock street tires. I know what axle hop feels like on FWD and RWD vehicles, and the Fusion Sport seems fine without any drama.
* 2017 Fusion Sport, 12.7 @ 108 mph tune-only (early tune of mine, bad trans settings), full trunk w/ lunch, and dirty paper air filter
* 2014 SHO non-PP, 12.4 @ 111 mph tune-only, all day long with dirty paper air filter and worn out 30k RS-As