1. Is the rear locking diff worth the wait of 1-2 more months for delivery?
In a word, NO. What you are doing is not the correct application for the locking diff.
2. Will the rear locking diff be much of a help in snow and ice?
Have you seen the recent snow in VA, I have avoided the idiots who cannot drive in the snow down here. I used to live in MA, and VT. The locking diff forces both tires to spin at exactly the same speed. This is good when you are in the dirt and something can slip. If you are in partially paved roads, you will tear up the rear end and tires every turn on pavement. Plus I will bet that you have to come to a complete stop in order to lock and unlock. (don't know)
3. Would the active brake limited slip be adequate without the rear locking diff to propel me through snow and ice?
The 4X4 and slip will work wonders! If you do slip the VDC will fight you back so fast you almost get whiplash. I tried it in a parking lot.
In a word, NO. What you are doing is not the correct application for the locking diff.
2. Will the rear locking diff be much of a help in snow and ice?
Have you seen the recent snow in VA, I have avoided the idiots who cannot drive in the snow down here. I used to live in MA, and VT. The locking diff forces both tires to spin at exactly the same speed. This is good when you are in the dirt and something can slip. If you are in partially paved roads, you will tear up the rear end and tires every turn on pavement. Plus I will bet that you have to come to a complete stop in order to lock and unlock. (don't know)
3. Would the active brake limited slip be adequate without the rear locking diff to propel me through snow and ice?
The 4X4 and slip will work wonders! If you do slip the VDC will fight you back so fast you almost get whiplash. I tried it in a parking lot.