Your AWD vehicle has a differential or some type of viscous coupling in between the two axles. If it is an open diff, you wouldn't be able to move with the front driveshaft disconnected. Since you can move, that indicates that you have an LSD in that center differential. If you drive it continuously with the front drive shaft removed, there is a decent chance you'll wear out that LSD fairly quickly. It would be like driving a vehicle with a rear LSD and one rear axle shaft removed.

1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.