If you aren't into cutting and splicing wires, CTDreamin via Moes Performance has taken the reins from RGory on building the Plug and Play kits.
Jump on this thread at the Dodge Talk Forums to sign up to get yours. Being able to use your lockers and disconnect the sway bar in any transfer case position. After this mod, here's what your Power Wagon will be able to do in addition to the current ability to engage lockers in 4 Low.
I think CTDreamin is gonna be a busy man for a little while. CAUTION: You will probably be able to engage the front lockers in 2WD with this mod also. At best, it won't do anything for you anyway since no power is being applied to the front axle, but you could potentially cause some damage.
CAUTION PART DEUX: When you engage the bypass, the computer will think you are in 4lo.
There may be computer safeguards built in if you travel at high speeds in bypass mode.
I personally have gone up to 40MPH 2wd in bypass mode with nothing weird happening, and it's been reported firsthand from another modder that they've gone up to 50MPH in bypass 2wd. While the above cautions cover two of the biggest "mistakes" that I can think of someone making, it's by no means the only ones.
Remember, you're doing this mod because you want more flexibility.
Use it wisely and don't do something stupid like engage the bypass in 2wd with rear lockers and then run 80MPH down the freeway.
You may not have any problems, or you may thrash your truck.
This is known to work on a 20 Power Wagon albiet you're looking for different wire colors on the '06 from what's in this how-to currently.
It should also work on 20 as they are supposed to be using the same sensor, but I don't have wiring diagrams for those years and don't know for sure.
NOTE: When I put this how-to together, I did so based on how I did my truck.