It's a true part time 4x4. That means it will always be in 2wd(rear wheel drive in our case), until you put the transfer case in 4high or 4low. Command trac works just like that, allowing no slippage between the front and rear tires. Selctrac has 4auto instead of 4high(same thing in this case), the only difference is the transfer case allows there to be some slippage. Essentially you will always be in rwd unless you're on slippery surfaces like dirt, sand, mud, snow and ice and switch to 4high/4auto. Selectrac you can get away with using on the road or in the rain without damage, but if you command trac NEVER use it on dry roads, even if it's raining it isn't slippery enough to constitute 4high.
As for safety ratings....those don't concern me at all. I'm also only 20 years old, and would prefer an old muscle car with no traction control, abs, seat belts, airbags etc.