I found a late-night parts store that had the dimmer in stock, so I spent the last couple of hours putting it in. Nothing like staying up til 2:00 on a work night. Everyone was right: it was the dimmer that was bad, not the MultiFunction Lever. As 90DesertTanYJ and rogerv described, there is a rod from the MF lever down to the dimmer switch. When you pull the MF lever, the rod extends and pushes the actuator on the dimmer. The dimmer switch SHOULD toggle from hi to lo and lo to hi. Hmmmm... maybe that is why they call it a switch.
The Haynes manual does not say to do this, but I had to loosen the column bolts and drop the column about an inch to get my size XXL hands and fingers in there to remove the nut, the screw, and the dimmer switch. Also, there is something very sharp under the dash - I sliced a finger pretty good.
Anyway, I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. Thanks for the help, everyone!