... The Mastertouch comes with the charcoal Fuel holder. If I want to do a light smoke, I can throw some wood chips on top, and have the fuel holders set up in indirect. Bingo, I'm smoking...
So, what's the point of the smokenator? Does the smokenator do anything different from what I just described? ...
Because you're experienced with the WSM you know that low heat and where the heat is plays a huge roll in "smoking" something. What the Smokenator does is emulate some aspects of your vertical smoker, with water pan and a place to put some smoke wood. Most of us probably agree that the kettle's basic design already allows for a setup at least as good if not better. Problem is, you can't market it ... and so, Internet.
And since smoking is often associated with low-and-slow, what often works best in the kettle is charcoal arranged around the edges in a "snake" or "fuse" formation. This does a few things: only a few coals are lit at a time, which keeps heat under control, and the heat moves around with the snake so that you don't have to rotate the grill grate during the long cook, and the center stays bare; the WSM 18's water pan and charcoal ring can be used there if you want or just a drip pan.