I also have an NV. I was inspired by the NV's I saw at advanced 4x4.
The NV front shocks have larger diameter post on top, and are longer stock than Titan. I was able to use Titan blocks up front though to get a few inches. It's not enough, in my opinion, as these are so close to the ground stock.
Nobody has done a SAS on one yet, as far as I have been able to find. Being as computerized as these are, it's a tough trick to find any axle swaps/upgrades at all. I have occasional traction problems, but living with it for now. I doubt we will ever see a locker available, sadly, unless they use this axle in the next Titan. With enough $$, it may be possible to have a dynatrac built axle, they made one for the Titan, shouldn't be too difficult to have them make different shafts for the NV to match bolt pattern. But, money is better spent elsewhere in our case. 4x4 conversion would be good. Only locker option is that route, and an ARB up front, which goes against convention.