I want the ability to disable it for a reason not mentioned.
Say I'm out on the road and one of these 35" tires goes flat or blows out....
I will only have a 265/70/17 spare to put on and the drivetrain will be pissed and/or damaged running the 1 smaller diameter tire no?
Umm. Unless u have a solid locker (non electric,ARB, etc) If you put on a smaller/bigger tire then the rest. The axle will absorb (even with a LSD or LS) a short drive with a smaller tire (I would think no more then 100 miles) with out any damage.
All it would do is run the smaller tire faster then the bigger tire. The spider gears in the open diff would spin off the extra spin. The LS or LSD should slip off the extra spin. If the LSD or LS is (frozen) solid with no movement. It would kill tires faster. If you run the two different tire for a long time. It would kill Diff's, t case, tranny. But I think this would be an extreme case. This would also be why u can run one rear tire at say 25psi and the other one at 45 psi for miles. yes the tire with lower psi would have a funny pattern on it.
I think that putting hubs on the front axle would not really be a Benefit. The t case would still pull the drive line, diff, gears, and axle shafts. All front hubs would do it unlock the power to the wheel and the front u joint. Not disconnected the t case.
On the t case. It has a magnetic unit. It will still "pull" the front tires while off the ground. But with the weight of the truck. their would be no torque to pull the truck.. So yes. killing power would kill the A4wd and still maintain the 4H/L.