I'd have to disagree that the twin-stick is useless. Not sure about the whole front-dig thing, as I thought that was done by the rear d-shaft disconnect as OOPs was just talking about. The twin stick allows you to disengage the front end, but still have the advantage of the lower gearing. There are times when you don't need 4WD, but the lower gearing is advantageous. With ARB/E-locker (whatever) and lower gearing, you can go alot of places, and not stress/break the front end. It's a simple, inexpensive mod that gives a huge amount of flexibility.
I am just now getting to it myself, as I didn't have much reason to drop the t-case till now. But since I had to anyway, it was well worth the few $$ and 1 hour to do it.