Jeff,
I'll grant you that the description you provided, if read closely, indicates these are scene only faceplates.
Here's another snippet from the same manual-
"Key Control Pads - The 16450 Group of Key Control Pads allows users to exercise ON/OFF switching control of lights and appliances as well as full-range dimming of incandescent and magnetic low-voltage lighting. Depending on the Key Control Pad chosen, they also can provide scene-lighting control over multiple incandescent and magnetic low-voltage lighting loads as well as "panic-button" control to turn ALL LIGHTS ON"
Words like "also" and "can" don't jump out at me and tell me that some of the devices are "only" scene transmitters.
To make your Diesel fuel analogy more propper, a gas station would place the fuel in the same pump (next to the gasoline), the same nozzel size, and label it 20 Octane (nominal rating for Diesel).
davmar,
To answer your original question - these faceplates can be made to work with certain Leviton Scene enabled switches. To do this you'll need to follow the Scene setup in the Leviton Manual.
They will not work with Smarthome, X10, or X10 pro devices.
You probably want the 16450-4 (on/off) or 16450-4D (dimming).