Since the stability system needs input as to the wheel speeds to determine its next course of action, I would venture that the ABS wheel sensors are utilized to determine the individual wheel speeds with regard to an overall average. Thus actuating the "stability" part of the system.
I would suggest that if you disabled the ABS (pull the fuse) that the stability program would disengage.
Either that or figure out how to "lie" to the ECU about 4wd. If it automatically disengages in this transfercase option, can you just jump the switch/sensor that relays the info to the ECU?