Is this a Full Time Demand Drive Solution?

I have a new 2015 Sportsman 570. I bought this machine only because it was a good deal. It replaced my Kawa 400 Bayou. I don’t get why CVT has replaced manuals. There is no engine braking on my base 570 and blipping the throttle when making a two thousand foot descent in the Tetons is a pain in the a**. and unnerving when RPM’s fall below engagement speed. Why do they call it True 4 wheel drive when it is actually 2WD with power to front OR rear but not both. I have read some posts about possible ways to keep the demand drive engaged by electrically energizing the drive but they are all speculative. This brings me to a speculation of my own that I would like some feed back on. If a larger tire was on the front the rear wheel would turn faster. Would the system read this as slip and engage the demand drive. If so and you had full time demand drive, is the drive up to continuous use.
Thanks for any input.